Bestfit Mainspring JA419 for 16s Illinois No. 47333 - Alloy

Bestfit Mainspring MS-JA419 for 16s Illinois movements, Factory No. 47333, alloy, new in package. See images for precise mainspring specifications. 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 an adequate job of representing the item.