ST-3500-3749

Classic straight caps 254mm - 298mm (10" - 11.75")
ST-3524
ST-3524
ST-3524
Size: 254mm (10")
Example in Photo: O-B (USA)
Catalog Year-No: 1913-No 10566
Photo Credit: Shaun Kotlarsky
Note: 1910 Austin patent for ball and socket style discs.
Patent: 947,274 - Patented Jan. 25, 1910
ST-3524
ST-3524
Size: 254mm (10")
Example in Photo: O-B (USA)
Photo Credit: Mid Norris
Note: O-B did not license there 1910 Austin patent for ball and socket style discs.
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
No Name (O-B)BrownUSA
O-B(O-B LOGO)GrayUSA
Victor(Incuse) (Victor R= ∞ logo)553Redish BrownUSA
Victor(Incuse) (Victor R= ∞ logo)(Number) / VICTOR // StarGrayUSA
ST-3525
ST-3525
ST-3525
Size: 254mm (10")
Example in Photo: Lapp (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Lapp(Incuse) (LI LOGO)Redish BrownUSA
ST-3527
ST-3527
ST-3527
Size: 254mm (10”)
Example in Photo: Locke (Fred Locke Attic Dig) (USA)
Photo Credit: Ken Willick
Notes: This Disc is from the Fred Locke attic dig, Be sure to check out the patent to see how these where used..
Patent: 779, 659 - Patented Jan. 10, 1905
Direct link to this insulator:
ManufacturerInsulator MarkingsColorCountry
Locke(Incuse) LOCKE PAT. JAN 10 1905BrownUSA
ST-3625
ST-3625
ST-3625
Size: 279mm (11”)
Example in Photo: No Name (Victor)
Photo Credit: Paul Greaves
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
No Name (Victor)Pumpkin OrangeUSA