WATCH-CRAFT Mainspring 2716W for Gruen 405 to 430 and Rolex 500 - Alloy

WATCH-CRAFT Mainspring 2716W for Gruen caliber 405, 406, 410, 411, 420, 421, 425, 426, 430 and Rolex caliber 500 movements plus perhaps other similar ébauche movements as well, white alloy, new in 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.