Comsco Mainspring #2019 for Waltham 1s Factory No. 2216 - Steel

Comsco Mainspring #2019 for Waltham 1s movements, Factory No. 2216, steel, new in likely frail envelope. Distributed by Burton M. Reid and Sons. See images for precise mainspring 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.