HR Mainspring SA732 for Waltham 0s Factory No. 2230 / 2278 - Alloy

HR Mainspring SA732 for 0s Waltham, Factory No. 2230 / 2278, alloy, 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. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.