Westclox Factory ALARM Mainspring In Barrel for Big Ben Alarm Clock

Westclox Factory ALARM Mainspring for Big Ben Alarm Clocks from the 1930's and 1940's (and perhaps beyond), new in dusty and/or torn envelope. I believe this fits Big Ben only which does not include the Chime Alarm model. Mainspring needs a very good and thorough cleaning before use. I likely have several of these so the one you get may differ slightly from the images. I sell a reprint of the factory parts and assembly catalog for this model of Alarm Clock if you need it, just check my other listings. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a suitable job of representing the item.