Marco Mainspring #534 for Illinois 12s movements Factory No. 47338 - Steel

Marco Mainspring #534 for Illinois 12s & 13s movements, Factory No. 47338, steel, new in envelope. See images for further details. 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 a pretty good job of representing the item.