Comsco Mainspring #1089 for Elgin 37s Car & Travel Clock Factory No. 4457 - Steel

Comsco Mainspring #1089 for Elgin 37s Car & Travel Clocks from the 1930's and 1940's (and perhaps beyond), Factory No. 4457, steel, new in envelope. Could also very well fit in other clocks as well. See images for precise mainspring specifications. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a suitable job of representing the item.