HR Mainspring SA101 for 18s Elgin No. 812 - Alloy

HR Mainspring SA 101 for Elgin 18s Factory No. 812, alloy, new in envelope, some may be in replacement envelopes. 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 a pretty good job of representing the item.