HR Nivastar Mainspring G621 for AS 1171, 1173, Kurth 257, 258, Font 60, Amida 515 - Alloy

HR Nivastar Mainspring G621 for AS 1171, 1173, Kurth 257, 258, Font 60, Amida 515 caliber movement plus perhaps similar ébauche watches, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in 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.