Marked Kopp Glass.
Kopp Glass Flat 7" Railroad Lantern Traffic Light Signal Lens Red
Vintage Kopp Glass ~ Amber Glass Lens 4 1/2" L 3 F ~ Lamp Lantern Signal ~ NOS
Vintage Kopp Glass Railroad Signal Lamp Amber Glass Lens 5 1/2D 1/2E
Vintage KOPP GLASS Railroad Highway Reflector XR7510 - 5-1/4" Blue Hobnail Glass
Vintage Kopp Glass Railroad Signal Lamp Amber Glass Lens 4 1/2D L3F
Vintage Kopp Glass Railroad Signal Lamp Amber Glass Lens 5 1/2D 1/2E a
