This is unusual 3 1/2 fso. Most are 3 fso. Glass is in very good condition condition.
Vintage 4" Corning Amber Fresnel Signal Lens For Railroad Lantern Switch Lamp
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Vtg Corning Amber Domed Ribbed Glass 1935 Railroad Signal Lens 5" D X 3 1/2" FSO
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Corning Red 4 1/2" X 3 1/2 F.S.O. 1935 Smooth Lantern Switch Lamp Railroad Glass
