Comsco Mainspring #1010-E for Waltham 12s Factory No. 2224 - Steel

Comsco Mainspring #1010-E for Waltham 12s Movements, Factory No. 2224, tab-end, steel, new in envelope. Distributed by Burton M. Reid and Sons. See images for precise mainspring specifications. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.