Ronda Mainspring No. 461 for Kurth 257, Becker 30 & Amida 515, 517 - Alloy

Ronda No. 461 Ronda-Flex Alloy mainspring for Kurth 257, Becker 30 & Amida 515, 517 caliber movements and perhaps others, alloy, new in open envelope. See images for precise mainspring specifications. 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.