HR Quick Fit Mainspring K621 for AS 1711, 1173, Kurth 257, 258, Font 60 - Alloy

HR Quick Fit K621 white alloy mainspring for AS 1171, 1173, Kurth 257, 258, Font 60, new in possibly replacement 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.