Marco Mainspring No.237 for 12s Waltham 19j Factory No. 2224A - Steel

Marco Mainspring No.237 for 12s Waltham 19j, Model 1894, Factory No. 2224A, steel, hole end, new in very frail envelope. See image for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.