Marco Mainspring #275 for Waltham 7½ ligne Model 750B No. 2250 - Steel

Marco Mainspring #275 for Waltham 7½ ligne Model 750 "B" Running Barrel movements, Factory No. 2250, steel, new in envelope. See images for further details. 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 a pretty good job of representing the item.