Comsco Mainspring #1021 for Waltham 0s Factory No. 2228 - Steel

Comsco Mainspring #1021 for Waltham 0s movements, Factory No. 2228, steel, new in envelope. Distributed by Burton M. Reid and Sons. See image for specifications and further details. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.