Cas-Ker Mainspring JA111 for 12s Elgin Pocket Watches #2874 - Alloy

Cas-Ker Mainspring JA-111 for 12s Elgin movements, likely made by Bestfit, Factory No. 2874, alloy, new in open 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.