Alloy Mainspring 60207 for 16s Hamilton No. 317 / 718041

Unmarked Maker but Swiss Made Alloy Mainspring HAM 60207 for 16s Hamilton, Factory No. 317 / 718041, T-end, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly form 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.