Marco Mainspring #530 for 12s Illinois Factory No. 47344 - Steel

Marco Mainspring #530 for 12s Illinois, Factory No. 47344 (Old # 236), 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.