Marco Mainspring #206 for 18s Waltham Factory No. 2205 - Steel

Marco Mainspring #206 for 18s Waltham Model 1883 17j movements, Factory No. 2205, steel, new in envelope. I likely have several of these so one you get may differ slightly from the images. See image for further details. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.