Favorite Permaflex Mainspring No. 610K for Gruen 416, 422,424, 452, 715, Rolex / Tudor 1182 - Alloy

Favorite Permaflex Mainspring No 610K for Buren 14, Felsa 100, Frenca 310, 311, 315, Gruen 416, 422, 424, 452, 715, Helbros 95, 99, Rolex / Tudor 1182 caliber movements plus perhaps similar ébauche watches as well, alloy, new in envelope. See images for further data and 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.