BESTFIT Mainspring JA404 for 18s Illinois Pocket Watches No. 47303 - Alloy

BESTFIT Mainspring MS-JA404 for 18s Illinois movements, Factory No. 47303, Alloy, new in envelope. See images for precise specifications. Should also fit an 18S Rockford, should you need one. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.