HR Quick Fit Mainspring No. K621 for Kurth 257, 258, H. Becker 80, Amida 515 - Alloy

HR Quick Fit No. K621 white alloy mainspring for AS 1171, 1173, Kuth 257, 258 H. Becker 80, Amida 515, Font 60, new in envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.