Cas-Ker Mainspring JA416 for 16s Illinois Pocket Watches #47331 - Alloy

Cas-Ker Mainspring MS-JA416 for 16s Illinois movements, likely made by Bestfit, Factory No. 47331, alloy, new in 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.