Marco Mainspring #593 for Illinois 18/0s Factory No. 47385 - Steel

Marco Mainspring #593 for Illinois 18/0s 1st to 5th model movements, Factory No. 47385, 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.