HR Mainspring SA761 for Waltham 6/0s Factory No. 2248 / 2265 - Alloy

HR Mainspring SA761 for 6/0s Waltham, Factory No. 2248 / 2265, alloy, new in seemingly over handled envelope. See images for precise mainspring specifications.  I likely have several of these so the one you get may differ slight 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.