HR Mainspring SA751 for Waltham 7½ ligne 750B movements No. 2264 - Alloy

HR mainspring SA751 for Waltham for 7½ ligne movements, specifically the 750B, Factory No. 2264, alloy, new in possibly frail 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. See image for further details. Images do a pretty good job of representing the item.