HR Mainspring A710 for 16s Waltham No. 2227 - Steel

HR Mainspring A710 for 16s Waltham, Factory No. 2227, hole end, steel, new in 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.