PM Mainspring for Illinois 12s No. 47344 - ONYX Steel

PM Mainspring for Illinois 12s movements, Factory No. 47344, ONYX-steel, 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.