Marco Mainspring #533 for 12s - 13s Illinois Factory No. 47336 - Steel

Marco Mainspring #533 for 12s - 13s Illinois Thin Model Motor Barrel, Factory No. 47336, 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. Most look to be repackaged factory mainsprings. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. See image for precise characteristics. Images do a pretty good job of representing the item.