Cas-Ker Mainspring JA313 for 3/0s Hampden No. 9696 - Alloy

Cas-Ker Mainspring MS-JA313 for 3/0s Hampden movements, Molly Stark and similar, likely made by Bestfit, Factory No. 9696, alloy, new in sealed package. 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 suitable job of representing the item.