Progress Mainspring for 6s Waltham Model 1890 Factory No. 2219 - Steel

Progress Mainspring for 6s Waltham Model 1890 Movements, Factory No. 2219, HOLE end, steel, new in envelope. 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.