Cas-Ker Mainspring JA511 for 10s N. Y. Standard Pocket Watch #7080 - Alloy

Cas-Ker Mainspring MS-JA511 for 10s N. Y. Standard movements, likely made by Bestfit, Factory No. 7080, 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.