Marco Mainspring #277 for Waltham Colonial Series Model C RB No. 2252 - Steel

Marco Mainspring No. 277 for Waltham Colonial Series (close to a 12s) Model C Running Barrel movements, Factory No. 2252, steel, new in frail envelope. See images for further details. 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