Manfacturer: Westinghouse Electric Corp.
These are the Westinghouse 100 watt 120 volt A-21 lamps with bayonet bases. It is extremely rare and unusual to find a US manfactured lamp with bayonet bases such as this one, since it is not a type of base commonly used in the USA, save for low pressure sodium lamps and a few A-15 railroad lamps. The bayonet base is very commonly used in England, however. It is unclear why Westinghouse made lamps like this one...maybe perhaps for use in fixtures imported from the UK or France that still use bayonet sockets. Today, a few light bulb stores in the USA still carry bayonet based A-19 lamps but most are just European or Asian made lamps with the only difference being fitted for 120V, except one big name, Philips, which still makes 120V bayonet lamps in Spain and are imported by AAMSCO or something like that. Additional photos can be seen below.
Lamp: Standard incandescent
Wattage: 100
Voltage: 120
Bulb: A-21
Finish: Inside Frosted
Base: B-22d Brass Bayonet
Class: C
Filament: CC-6 w/ 1 support
Lamp Life: 750 hours
Manf. Date: 1960s (exact date not known)
Country of
Orgin: USA
