Jurgensen Mainspring #628 for Elgin 4/0s Factory No. 4789 - Steel

Jurgensen Mainspring #628 for Elgin 4/0s, Factory No. 4789, steel, new in envelope. See images for further details and 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 a pretty good job of representing the item.