HR Mainspring SA710 for Waltham 16s movements Factory No. 2227 / 2267 - Alloy

HR Mainspring SA710 for Waltham 16s movements, Factory No. 2227 / 2267, hole end, 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.