Marco Mainspring #461 for 0s Hamilton 17j Model 985, Factory No. 1535 - Steel

Marco (C&E Marshall) Mainspring #461 for 0s Hamilton 17j, Factory No. 1535, steel, new in envelope. See images for further details. 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.