BESTFIT Mainspring JA406 for Illinois 16s Factory No. 47309 for 60hr - Alloy

BESTFIT Mainspring MS-JA406 for Illinois 16s, Factory No. 47309 for all 60hr, alloy, new in envelope. 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 in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.