U-81-100

(Through pin hole styles including mine and transposition insulators)
U-81
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-81
Size: 57mm X 63mm (2 ¼ x 2 ½)
Example in Photo: No Name (Pittsburg)
Photo Credit: Matt Grayson
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U-84
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)
U-84
Size: 73mm X 63mm (2 x 2 ½)
Example in Photo: No Name (USA)
Photo Credit: Matt Grayson
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U-85
Manufacturer or Marking
No Name (Dry Process) (USA)
U-85
Size: 76mm X 69mm (3 x 2 ¾)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Matt Grayson
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U-89
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)
U-89
Size: 63mm X 63mm (2 ½ x 2 ½)
Example in Photo: No Name (USA)
Photo Credit: Matt Grayson
To directly link to this image copy and paste below URL:
U-89A
Manufacturer or Marking
T inside a circle (Thomas) (USA)
U-89A
Size: 63mm X 63mm (2 ½ x 2 ½)
Example in Photo: T inside a circle (Thomas) (USA)
Photo Credit: Ted Wilush
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U-90
Manufacturer or Marking
THOMAS (6053) (USA)
U-90
Size: 63mm X 68mm (2 ½ x 3 ½)
Example in Photo: THOMAS (6053) (USA)
Photo Credit: Mat Grayson
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U-91
Manufacturer or Marking
No Name (USA)
U-91
Size: 63mm X 68mm (2 ½ x 3 ½)
Example in Photo: No Name (USA)
Photo Credit: Mat Grayson
To directly link to this image copy and paste below URL:
U-92
Manufacturer or Marking
No Name (Dry Process) (USA)
U-92
Size: 69mm X 66mm (2 ¾ x 2 ⅝)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: John Serniak
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U-94
Manufacturer or Marking
No Name (USA)
ELRECO CIN TI O (USA)
(O-B) (USA)
O-B/ Square D (USA)
U-94
Size: 76mm X 92mm (3 x 3 ⅝)
Example in Photo: No Name (USA)
Photo Credit: Matt Grayson
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U-97
Manufacturer or Marking
O-B (Dry Process) (USA)
U-97
Size: 69mm X 73mm (2 ¾ x 2 ⅞)
Example in Photo: No Name (USA)
Photo Credit: Matt Grayson
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U-98
Manufacturer or Marking
COOKE WILSON E. S. CO. (Dry Process) (USA)
No Name (USA)
No Name (Dry Process) (USA)

NOTE: In 2008 and older reference books, There was a U-98A. The listings are now merged with U-98. U-98A is now used for what was called U-98C (Fred Locke Unit)
U-98
Size: 60mm X 88mm (2 ¾ x 3 ½)
Example in Photo: No Name (USA)
Photo Credit: Mat Grayson
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U-98A
Manufacturer or Marking
Fred Locke (USA)

NOTE: In 2008 and older reference books, This was listed as U-98C. It is now moved to U-98A. See U-98 for more info.
U-98A
Size: 66mm X 82mm (2 x 3 ¼)
Example in Photo: Fred Locke (USA)
Photo Credit: Elton Gish
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U-98B
Manufacturer or Marking
G.P. Co. (USA)
U-98B
Size: 66mm X 88mm (2 x 3 ½)
Example in Photo: G.P. Co. (USA)
Photo Credit: Matt Grayson
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U-99
Manufacturer or Marking
No Name (Threadless) (USA)
U-99
Size: 76mm X 104mm (3 x 4 ⅛)
Example in Photo: No Name (Threadless) (USA)
Photo Credit: Chris Hedges
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U-100
Manufacturer or Marking
No Name (Thomas) (USA)
U-100
Size: 66mm X 95mm (2 x 3 ¾)
Example in Photo: No Name (Thomas) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL: