U-701-775

(Cable top styles with two inner skirts)
U-701
Manufacturer or Marking
No Name (G.E.) (USA)
U-701
Size: 114mm X 149mm (4 ½ x 5 ⅞)
Example in Photo: No Name (G.E) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-702
Manufacturer or Marking
No Name (New Lexington, Flat inner Skirt) (USA)
U-702
Size: 107mm X 85mm (4 ¼ x 3 ⅜)
Example in Photo: No Name (New Lexington, Flat inner Skirt) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-704
Manufacturer or Marking
G.P.Co. (USA)
U-704
Size: 111mm X 85mm (4 x 3 )
Example in Photo: G.P.Co. (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-704A
Manufacturer or Marking
No Name (USA)
U-704A
Size: 127mm X 82mm (5 x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-705
Manufacturer or Marking
CP (Canada)
No Name (Pittsburg) (USA)
No Name (USA)
No Name (Locke) (USA)
No Name (Akron HP) (USA)
LIMA N.Y. (USA)
LOCKE (USA)
LOCKE R = ∞ (USA)
O-B (USA)
P.P. Inc. (USA)

NOTE: Canadian units are also known as U-2701 in the “Worldwide Porcelain Insulators Chart”
Size: 120mm X 88mm (4 ¾ x 3 ½)
Variations: Click on the thumbnail above to see style variations
Variations: Tap on the thumbnail above to see style variations
To directly link to this image copy and paste below URL:
U-705A
Manufacturer or Marking
THOMAS (USA)
U-705A
Size: 120mm X 82mm (4 ¾ x 3 ¼)
Example in Photo: THOMAS (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-705B
Manufacturer or Marking
Findlay (USA)
No Name (USA)

NOTE: In 2008 and older reference books, this was known as U-705C
Size: 120mm X 82mm (4 ¾ x 3 ¼)
Variations: Click on the thumbnail above to see style variations
Variations: Tap on the thumbnail above to see style variations
To directly link to this image copy and paste below URL:
U-706
Manufacturer or Marking
No Name (Pinco) (USA)
Franklin Porcelain (USA)
Franklin Porcelain (Keystone F Marking) (USA)
No Name (Pinco) (USA)
Pinco (USA)
P.P. Inc. (USA)
Westinghouse (USA)
U-706
Size: 120mm X 88mm (4 ¾ x 3 ½)
Example in Photo: No Name (Pinco) (USA)
Photo Credit: Greg Hale
To directly link to this image copy and paste below URL:
U-706A
Manufacturer or Marking
No Name (USA)
CENTRAL (Thomas) (USA)
U-706A
Size: 114mm X 92mm (4 ½ x 3 )
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-707
Manufacturer or Marking
No Name (USA)
Pinco (USA)
U-707
Size: 120mm X 92mm (4 ¾ x 3 )
Example in Photo: Pinco (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-707A
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)

NOTE: In 2008 and older reference books, there was a U-707B listed. Listing are now part of U-707A.
U-707A
Size: 123mm X 88mm (4 x 3 ½)
Example in Photo: No Name (Thomas) (USA)
Photo Credit: Greg Hale
To directly link to this image copy and paste below URL:
U-708
Manufacturer or Marking
No Name (Pittsburg, 2-part Glazeweld) (USA)
U-708
Size: 127mm X 101mm (5 x 4)
Example in Photo: No Name (Pittsburg, 2-part Glazeweld) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-708A
Manufacturer or Marking
No Name (Lima) (USA)
U-708A
Size: 127mm X 92mm (5 x 3 )
Example in Photo: No Name (Lima) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-709
Manufacturer or Marking
No Name (New Lexington) (USA)
U-709
Size: 127mm X 95mm (5 x 3 ¾)
Example in Photo: No Name (New Lexington) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-709A
Manufacturer or Marking
No Name (Akron?, Dry Process) (USA)
No Name (New Lexington) (USA)
No Name (Thomas) (USA)
PITTSBURG (USA)
THOMAS (USA)
U-709A
Size: 127mm X 98mm (5 x 3 )
Example in Photo: No Name (Thomas) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-709B
Manufacturer or Marking
JOHNS-MANVILLE (Pittsburg) USA)
U-709B
Size: 133mm X 101mm (5 ¼ x 4)
Example in Photo: JOHNS-MANVILLE (Pittsburg) USA)
Photo Credit: Shaun Kotlarsky
In the collection of: Rick Soller
To directly link to this image copy and paste below URL:
U-710
Manufacturer or Marking
No Name (Imperial) (USA)
No Name (Pittsburg) (USA)
Imperial (USA)
PITTSBURG (USA)
U-710
Size: 133mm X 95mm (5 ¼ x 3 ¾)
Example in Photo: Imperial (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-710A
Manufacturer or Marking
No Name (New Lexington) (USA)
U-710A
Size: 130mm X 95mm (5 x 3 ¾)
Example in Photo: No Name (New Lexington) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-711
Manufacturer or Marking
No Name (USA)
Pinco (USA)
P.P. Inc. (USA)
U-711
Size: 136mm X 107mm (5 ½ x 3 ½)
Example in Photo: No Name (USA)
Photo Credit: Robin Harrison
To directly link to this image copy and paste below URL:
U-711A
Manufacturer or Marking
No Name (USA)
U-711A
Size: 133mm X 85mm (5 ¼ x 3 )
Example in Photo: No Name (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-711B
Manufacturer or Marking
No Name (USA)
U-711B
Size: 136mm X 107mm (5 x 4 ¼)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-711C
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-711C
Size: 139mm X 98mm (5 ½ x 3 )
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Shaun Kotlarsky
In the collection of: Mike Spadafora
To directly link to this image copy and paste below URL:
U-712
Manufacturer or Marking
No Name (OB) (USA)
U-712
Size: 152mm X 120mm (6 x 4 ¾)
Example in Photo: No Name (OB) (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-712A
Manufacturer or Marking
No Name (OB) (USA)
U-712A
Size: 142mm X 127mm (5 x 5)
Example in Photo: No Name (OB) (USA)
Photo Credit: Denis Stewert
To directly link to this image copy and paste below URL:
U-713
Manufacturer or Marking
No Name (New Lexington) (USA)
No Name (Imperial?) (USA)
VICTOR R = ∞ (USA)
Imperial (USA)
Victor R = ∞ 91071A (USA)
U-713
Size: 152mm X 101mm (6 x 4)
Example in Photo: VICTOR R = ∞ (USA)
Photo Credit: Unknown
To directly link to this image copy and paste below URL:
U-713A
Manufacturer or Markin
No Name (CP, 2 part Glazeweld) (Canada)
No Name (New Lexington, 2 part Glazeweld) (USA)

NOTE: In 2008 and older reference books, this was know as U-931B

ALSO NOTE: No Name (CP, 2 part Glazeweld) (Canada) (Canada) Units should also have a U-Number in the “Worldwide Porcelain Insulators Chart” range as U-1-999 are US only styles. No “Worldwide Porcelain Insulators” U-Number is yet available for this unit.
U-713A
Size: 152mm X 101mm (6 x 4)
Example in Photo: No Name (New Lexington, 2 part Glazeweld) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-716
Manufacturer or Markin
Pinco (USA)
U-716
Size: 165mm X 88mm (6 ½ x 3 ½)
Example in Photo: Pinco (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-717
Manufacturer or Markin
No Name (USA)
P.P. Inc. (USA)
U-717
Size: 177mm X 111mm (7 x 4 ⅜)
Example in Photo: P.P. Inc. (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-718
Manufacturer or Markin
Locke (USA)
U-718
Size: 184mm X 95mm (7 ¼ x 3 ¾)
Example in Photo: Locke (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-720
Manufacturer or Markin
No Name (Westinghouse)
Westinghouse (USA)
U-720
Size: 120mm X 95mm (4 ¾ x 3 ¾)
Example in Photo: Westinghouse (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-721
Manufacturer or Marking
No Name ( Pittsburg) (USA)
No Name (J-D) (USA)
No Name (USA)
P.P. Inc. (USA)
U-721
Size: 123mm X 85mm (4 x 3 ⅜)
Example in Photo: P.P. Inc. (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-722
Manufacturer or Marking
No Name (USA)
Lapp (USA)
U-722
Size: 120mm X 85mm (4 ¾ x 3 ⅜)
Example in Photo: Lapp (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-722A
Manufacturer or Marking
No Name (USA)
No Name (J-D) (USA)
COOK (USA)
Hartford Faience (A109) UUSA)
Lapp (USA)
THOMAS (USA)
U-722A
Size: 120mm X 88mm (4 ¾ x 3 ½)
Example in Photo: Hartford Faience (A109) (USA)
Photo Credit: Zac Mirecki
To directly link to this image copy and paste below URL:
U-723
Manufacturer or Marking
Illinois Map (361) (USA)
U-723
Size: 120mm X 95mm (4 ¾ x 3 ¾)
Example in Photo: Illinois Map (361) (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-724
Manufacturer or Marking
Illinois Map (361) (USA)
U-724
Size: 120mm X 95mm (4 ¾ x 3 ¾)
Example in Photo: Illinois Map (361) (USA)
Photo Credit: Unknown
To directly link to this image copy and paste below URL:
U-725
Manufacturer or Marking
No Name (USA)
Lapp (USA)
U-725
Size: 120mm X 88mm (4 ¾ x 3 ½)
Example in Photo: Lapp (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-726
Manufacturer or Marking
THOMAS (USA)
U-726
Size: 123mm X 101mm (4 x 4)
Example in Photo: THOMAS (USA)
Photo Credit: Denis Stewert
To directly link to this image copy and paste below URL:
U-726A
Manufacturer or Marking
THOMAS (USA)
U-726A
Size: 139mm X 101mm (5 ½ x 4)
Example in Photo: THOMAS (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-726B
Manufacturer or Marking
No Name (Thomas, 2 Part Glazeweld) (USA)
THOMAS (2 Part Glazeweld) (USA)


NOTE: In 2008 and older reference books, there was a U-950 listed. Listing are now moved to U-726B.
U-726B
Size: 127mm X 104mm (5 x 4 )
Example in Photo: No Name (Thomas, 2 Part Glazeweld) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-727
Manufacturer or Marking
No Name (USA)
U-727
Size: 127mm X 120mm (5 x 3 ¾)
Example in Photo: No Name (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-728
Manufacturer or Marking
No Name (USA)
COOK (USA)
Lapp (USA)
U-728
Size: 139mm X 98mm (5 ½ x 3 ⅞)
Example in Photo: Lapp (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-729
Manufacturer or Marking
No Name (USA)
Chance (USA)
Lapp (USA)
Lapp (6183, RFI) (USA)
Lapp (with C.F. CO. & Lightning Bolt)
U-729
Size: 139mm X 101mm (5 ½ x 4)
Example in Photo: Lapp (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-730
Manufacturer or Marking
Franklin Porcelain (USA)
O-B (USA)
P.P. Inc. (USA)
THOMAS (USA)

NOTE: In 2008 and older reference books, there was a U-732A and U-732B listed. Listing are now part of U-730.
U-730
Size: 139mm X 107mm (5 ½ x 4 ¼)
Example in Photo: P.P. Inc. (USA)
Photo Credit: Greg Hale
To directly link to this image copy and paste below URL:
U-731
Manufacturer or Marking
FPCo. (USA)
Hartford Faience (A110) (USA)
Illinois (USA)
Locke (USA)
No Name (CP) (Canada)
THOMAS (USA)
Victor Ins. Inc. (USA)

NOTE: No Name (CP) (Canada) Units should also have a U-Number in the “Worldwide Porcelain Insulators Chart” range as U-1-999 are US only styles. No “Worldwide Porcelain Insulators” U-Number is yet available for this unit.
U-731
Size: 139mm X 101mm (5 ½ x 4)
Example in Photo: THOMAS (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-731A
Manufacturer or Marking
No Name (Akron H-P) (USA)

NOTE: In 2008 and older reference books, there was a U-927D listed. Listing are now moved to U-731A.
U-731A
Size: 139mm X 95mm (5 ½ x 3 ¾)
Example in Photo: No Name (Akron H-P) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-732
Manufacturer or Marking
No Name (USA)
Chance (USA)
J-D (USA)
O-B (USA)
THOMAS (USA)
U-732
Size: 139mm X 107mm (5 ½ x 4 ¼)
Example in Photo: O-B (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-733
Manufacturer or Marking
No Name (Westinghouse) (USA)
Westinghouse (USA)
U-733
Size: 139mm X 101mm (5 ½ x 4)
Example in Photo: Westinghouse (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-734
Manufacturer or Marking
GLADCO (USA)
Pinco (USA)
U-734
Size: 139mm X 107mm (5 ½ x 4 ¼)
Example in Photo: General Electric (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-734A
Manufacturer or Marking
Knox (USA)
O-B (USA)
P.P. Inc. (USA)
THOMAS (USA)
U-734A
Size: 139mm X 107mm (5 ½ x 4 ¼)
Example in Photo: THOMAS (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-734B
Manufacturer or Marking
No Name (USA)
Pinco (USA)
U-734B
Size: 139mm X 107mm (5 ½ x 4 ¼)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-735
Manufacturer or Marking
No Name (USA)
Cooper Power Systems (USA)
Gould (USA)
NKG (USA)
McGraw Edison (USA)
O-B (USA)
Pinco (USA)
PP-KNOX (USA)
U-735
Size: 139mm X 111mm (5 ½ x 4 ⅜)
Example in Photo: O-B (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-735A
Manufacturer or Marking
GLADCO (USA)
Locke (USA)
O-B (USA)
Pinco (USA)
U-735A
Size: 139mm X 111mm (5 ½ x 4 ⅜)
Example in Photo: GLADCO (USA)
Photo Credit: Mid Norris
To directly link to this image copy and paste below URL:
U-736
Manufacturer or Marking
Knox (USA)
Line Material (USA)
Locke (USA)
McGraw Edison (USA)
NGK (USA)
O-B (USA)
U-736
Size: 139mm X 111mm (5 ½ x 4 ⅜)
Example in Photo: KNOX (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-737
Manufacturer or Marking
No Name (USA)
BBC (USA)
Gould (USA)
ITE (USA)
O-B (USA)
PP-KNOX (USA)
Victor Ins. Inc. (USA)
U-737
Size: 139mm X 111mm (5 ½ x 4 ⅜)
Example in Photo: No Name (USA)
Photo Credit: Bob Berry
To directly link to this image copy and paste below URL:
U-738
Manufacturer or Marking
Chance (USA)
General Electric (USA)
Locke (USA)
Locke (23583) (USA)
Pinco (USA)
O-B (USA)

NOTE: In 2008 and older reference books, there was a U-736A listed. Listing are now part of U-738.
U-738
Size: 139mm X 117mm (5 ½ x 4 ⅝)
Example in Photo: Chance (USA)
Photo Credit: Unknown
To directly link to this image copy and paste below URL:
U-739
Manufacturer or Marking
Chance (USA)
U-739
Size: 146mm X 114mm (5 ¾ x 4 ½)
Example in Photo: Chance (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-740
Manufacturer or Marking
LI (Unknown Meaning) (USA)
O-B (USA)
Size: 146mm X 114mm (5 ¾ x 4 ½)
Variations: Click on the thumbnail above to see style variations
Variations: Tap on the thumbnail above to see style variations
To directly link to this image copy and paste below URL:
U-742
Manufacturer or Marking
COOK (USA)
U-742
Size: 152mm X 104mm (6 x 4 ⅛)
Example in Photo: COOK (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-743
Manufacturer or Marking
No Name (Pittsburg) (USA)
No Name (USA)
O-B (USA)
VICTOR (USA)
Victor R = ∞ (USA)

NOTE: In 2008 and older reference books, there was a U-933 listed. Listing are now moved to U-743.
U-743
Size: 165mm X 95mm (6 ½ x 3 ¾)
Example in Photo: Victor R = ∞ (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-743A
Manufacturer or Marking
No Name (Pittsburg) (USA)
Victor R= ∞ (3-Part Glazeweld) (USA)

NOTE: In 2008 and older reference books, there was a U-933B listed. Listing are now moved to U-743A.
U-743A
Size: 168mm X 120mm (6 x 4 ¾)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-744
Manufacturer or Marking
No Name (G.E.) (USA)
U-744
Size: 152mm X 111mm (6 x 4 ⅜)
Example in Photo: No Name (G.E.) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-745
Manufacturer or Marking
No Name (Locke) (USA)
No Name (New Lexington) (USA)
Triangle M (USA)
U-745
Size: 152mm X 101mm (6 x 4)
Example in Photo: No Name (New Lexington) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-745A
Manufacturer or Marking
No Name (Pittsburg, 2-Part glazeweld) (USA)
No Name (2-Part glazeweld)
U-745A
Size: 149mm X 95mm (5 x 3 ¾)
Example in Photo: No Name (Pittsburg, 2-Part glazeweld) (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-745B
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-745B
Size: 149mm X 107mm (5 x 4 ¼)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-745C
Manufacturer or Marking
No Name (Illinois or Triangle M) (2-Part glazeweld) (USA)
Triangle M (2-Part glazeweld) (USA)
U-745C
Size: 152mm X 101mm (6 x 4)
Example in Photo: No Name (Illinois or Triangle M) (2-Part glazeweld) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-745D
Manufacturer or Marking
Victor R= ∞ (USA)
U-745D
Size: 152mm X 101mm (6 x 4)
Example in Photo: Victor R= ∞ (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-746
Manufacturer or Marking
No Name (USA)
No Name (New Lexington) (USA)
91075 (Johns-Manville) (USA)
No Name (DATE) (New Lexington) (USA)
No Name (DATE 1-20 (6) -03 (USA)
CP (Canada)
Imperial Crown Logo (USA)
JHONS- MANVILLE (USA)
K (Canada)
NEW LEXINGTON, O. (USA)
PITTSBURG (USA)
VICTOR R = ∞ (USA)

NOTE: In 2008 and older reference books, there was a U-746E listed. Listing are now part of U-746.

ALSO NOTE: CP (Canada) and K (Canada) Units should also have a U-Number in the “Worldwide Porcelain Insulators Chart” range as U-1-999 are US only styles. No “Worldwide Porcelain Insulators” U-Number is yet available for this unit.
U-746
Size: 171mm X 123mm (6 ¾ x 4 ⅞)
Example in Photo: NEW LEXINGTON, O. (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-746A
Manufacturer or Marking
No Name (Pittsburg, 2-part glazeweld) (USA)
U-746A
Size: 168mm X 127mm (6 x 5)
Example in Photo: No Name (Pittsburg, 2-part glazeweld) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-746B
Manufacturer or Marking
No Name (New Lexington, 2-part glazeweld) (USA)
U-746B
Size: 171mm X 130mm (6 ¾ x 5 ⅛)
Example in Photo: No Name (New Lexington, 2-part glazeweld) (USA)
Photo Credit: Mark Johnson
To directly link to this image copy and paste below URL:
U-746C
Manufacturer or Marking
No Name (Pittsburg, 2-Part glazeweld) (USA)
U-746C
Size: 171mm X 114mm (6 ¾ x 4 ½)
Example in Photo: No Name (Pittsburg, 2-Part glazeweld) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-746D
Manufacturer or Marking
No Name (Pittsburg, 2-Part glazeweld) (USA)
U-746D
Size: 180mm X 127mm (7 x 5)
Example in Photo: No Name (Pittsburg, 2-Part glazeweld) (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-747
Manufacturer or Marking
Lapp (USA)
U-747
Size: 168mm X 114mm (6 x 4 ½)
Example in Lapp (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-747A
Manufacturer or Marking
No Name (Thomas) (USA)
U-747A
Size: 161mm X 104mm (6 x 4 ⅛)
Example in No Name (Thomas) (USA)
Photo Credit: Bill Haley
To directly link to this image copy and paste below URL:
U-748
Manufacturer or Marking
No Name (USA)
Locke (USA)
LOCKE R = ∞ (USA)
VICTOR (USA)
U-748
Size: 177mm X 101mm (7 x 4)
Example in Photo: LOCKE R = ∞ (USA)
Photo Credit: Connor Stoehr
To directly link to this image copy and paste below URL:
U-750
Manufacturer or Marking
No Name (OB) (USA)
LOCKE (USA)
LOCKE (23514) (USA)
Pinco (USA)
THOMAS (USA)
U-750
Size: 177mm X 107mm (7 x 4 ¼)
Example in Photo: No Name (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-751
Manufacturer or Marking
No Name (USA)
Franklin Porcelain (Keystone Logo) (USA)
Hartford Faience (A112) (USA)
Knox (USA)
LOCKE R = ∞ (USA)
Pinco (USA)

NOTE: In 2008 and older reference books, there was a U-749 listed. Listing are now part of U-751.
U-751
Size: 177mm X 107 (7 x 4 ¼)
Example in Photo: No Name (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-751A
Manufacturer or Marking
VICTOR R = ∞ (USA)

U-751A
Size: 184mm X 107 (7 ¼ x 4 ¼)
Example in Photo: VICTOR R = ∞ (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-752
Manufacturer or Marking
No Name (USA)
Westinghouse (USA)
U-752
Size: 177mm X 107mm (7 x 4 ¼)
Example in Photo: No Name (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-753
Manufacturer or Marking
No Name (USA)
J-D (USA)
THOMAS (USA)
Westinghouse (USA)
U-753
Size: 177mm X 117mm (7 x 4 ⅝)
Example in Photo: No Name (J-D)
Photo Credit: National Insulator association
To directly link to this image copy and paste below URL:
U-754
Manufacturer or Marking
Locke (USA)
O-B (USA)
THOMAS (USA)
U-754
Size: 177mm X 117mm (7 x 4 ⅝)
Example in Photo: O-B (USA)
Photo Credit: Unknown
To directly link to this image copy and paste below URL:
U-755
Manufacturer or Marking
No Name (JD) (USA)
LOOKE (Locke Error) (USA)
Pinco (USA)
U-755
Size: 177mm X 114mm (7 x 4 ½)
Example in Photo: No Name (JD) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-756
Manufacturer or Marking
No Name (USA)
Lapp (USA)
McGraw Edison (USA)
U-756
Size: 177mm X 114mm (7 x 4 ½)
Example in Photo: Lapp (USA)
Photo Credit: Unknown
To directly link to this image copy and paste below URL:
U-757
Manufacturer or Marking
No Name (USA)
Knox (USA)
Locke (23514) (USA)
Thomas (USA)
Victor R = ∞ (USA)
Victor Insulator Inc. (USA)
U-757
Size: 177mm X 117mm (7 x 4 ⅝)
Example in Photo: Locke (23514) (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-758
Manufacturer or Marking
No Name (USA)
Chance (USA)
O-B (USA)
P.P. Inc. (USA)
U-758
Size: 177mm X 127mm (7 x 5)
Example in Photo: No Name (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-760
Manufacturer or Marking
GLADCO (USA)
ICB/FWC (USA)
Knox (USA)
O-B (USA)
Pinco (L367) (USA)
THOMAS (USA)

NOTE: In 2008 and older reference books, there was a U-759 listed. Listing are now part of U-760.
U-760
Size: 177mm X 123mm (7 x 4 ⅞)
Example in Photo: O-B (USA)
Photo Credit: Shaun Kotlarsky
U-761
Manufacturer or Marking
Line Material (NP 22) (USA)
Locke (USA)
O-B (USA)
U-761
Size: 177mm X 123mm (7 x 4 ⅞)
Example in Photo: O-B (USA)
Photo Credit: Shaun Kotlarsky
U-761A
Manufacturer or Marking
Chance (USA)
U-761A
Size: 177mm X 127mm (7 x 5)
Example in Photo: Chance (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-762
Manufacturer or Marking
Gould (USA)
ITE (90) (USA)
McGraw Edison (USA)
Victor (USA)
U-762
Size: 177mm X 123mm (7 x 4 ⅞)
Example in Photo: McGraw Edison (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-763
Manufacturer or Marking
No Name (USA)
General Electric (USA)
Line Material (USA)
Locke (23584 (USA)
O-B (USA)
Pinco (USA)
McGraw Edison (USA)
U-763
Size: 177mm X 127mm (7 x 5)
Example in Photo: General Electric (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-764
Manufacturer or Marking
O-B (USA)
U-764
Size: 177mm X 127mm (7 x 5)
Example in Photo: O-B (USA)
Photo Credit: James Lindsey
To directly link to this image copy and paste below URL:
U-767
Manufacturer or Marking
No Name (Cook 70) (USA)
Lapp (USA)
THOMAS (USA)
U-767
Size: 184mm X 114mm (7 ¼ x 4 ½)
Example in Photo: Lapp (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL:
U-768
Manufacturer or Marking
COOK (1445) (USA)
U-768
Size: 184mm X 120mm (7 ¼ x 4 ¾)
Example in Photo: COOK (1445) (USA)
Photo Credit: Ben Kirsten
To directly link to this image copy and paste below URL:
U-769
Manufacturer or Marking
Lapp (2063) (USA)
U-769
Size: 187mm X 114mm (7 x 4 ½)
Example in Photo: Lapp (2063) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-770
Manufacturer or Marking
GLADCO) (USA)
Lapp (6163) (USA)
Lapp (7061) (USA)
THOMAS (USA)
U-770
Size: 196mm X 114mm (7 ¾ x 4 ½)
Example in Photo: THOMAS (USA)
Photo Credit: Robin Harrison
To directly link to this image copy and paste below URL:
U-774
Manufacturer or Marking
Chance (USA)
Knox (USA)
McGraw Edison (ME) (USA)
ITE (11) (USA)

NOTE: the ITE unit was known as U-775 in 2008 and older reference books.
U-774
Size: 212mm X 139mm (8 x 5 ½)
Example in Photo: McGraw Edison (ME) (USA)
Photo Credit: Charles Robinson
To directly link to this image copy and paste below URL: