Marco Mainspring #212 for Waltham 16s 17j Factory No. 2227 - Steel

Marco Mainspring No. 212 for Waltham 16s Model 1899 & 1908 17j movements, Factory No. 2227, steel, new in possibly frail envelope. See images for further details and 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item