KOPP - 1935 – “5½ D ½ F” Embossed on Inside of Glass.
NOS Vintage Railroad Lantern Replacement Green Glass Mfg Kopp Glass 5” Dia
Red Ribbed Kopp Glass 5⅜ L 2½ F 30° Railroad Light Switch Lamp Lens Stepped
Vintage Kopp Glass Railroad Signal Lamp Amber Glass Lens 5 1/2D 1/2E
Vintage Kopp Glass Railroad Signal Lamp Amber Glass Lens 5 1/2D 1/2E a
Vintage Railroad Signal Glass Lenses Red Blue Amber 4.5” Kopp Glass Set Of 3
