BESTFIT Mainspring JA743 for Waltham Colonial B Factory No. 2237 / 2269 - Alloy

BESTFIT Mainspring MS-JA743 for Waltham Colonial B movements, Factory No. 2237 / 2269, alloy, new in packaging. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.