Comsco Mainspring #1012 for Waltham 12s Colonial A Factory No. 2224A - Steel

Comsco Mainspring #1012 for Waltham 12s Colonial A Movements, Factory No. 2224A, steel, new in envelope. Distributed by Burton M. Reid and Sons. See image 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.