HR Quick Fit Mainspring K536 for Parrenin 90, Forster 50, 500 & Recta F - Alloy

HR Quick Fit Mainspring K536 for Langendorf 1021, 1233, Parrenin 90, Forster 50, 500, Recta F movements, white alloy, new in 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.