BESTFIT Mainspring JA421 for Illinois 16s Factory No. 47334 - Alloy

Bestfit Mainspring MS-JA421 for Illinois 126 movements, Factory No. 47334, 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 an adequate good job of representing the item.