BESTFIT Mainspring JA703 for 18s Waltham Factory No. 2203 - Alloy

Bestfit Mainspring MS-JA703 for 18s Waltham New Model, Factory number 2203, alloy, new in open envelope. See images for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.