Elgin Factory Mainspring for Elgin 37s 8-Day Clocks #4457 - Steel

Elgin Factory Mainspring for 37s 8-Day clocks, Factory No, 4457, steel, new in frail and/or replacement envelope. Used in many different applications, including car clocks, aircraft clocks, travel clocks, ships clocks, and really big pocket watches. Elgin mainsprings are typically coated in very old grease and must be cleaned before use - these are also especially dusty. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.