Comsco Mainspring #1024 for Waltham 3/0s Factory No. 2230 - Steel

Comsco Mainspring #1024 for Waltham 3/0s, Factory No. 2230, steel, new in envelope. Distributed by Burton M. Reid and Sons. See image for precise mainspring specifications. 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 a marginally adequate job of representing the item.