HR Mainspring SA763 for Waltham Model 678 #2251 / 2262 - Alloy

HR Mainspring for SA763 6¾ & 8 ligne model 678, Waltham, Factory No. 2251 / 2262, 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 in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate good job of representing the item.