GR Nivaflex Mainspring for Cyma 433, 434, Felsa 197, Tudor 138 - Alloy

GR Nivaflex Mainspring for Cyma 433, 434, Felsa 197, Tudor 138, Glycine 100 caliber movements plus perhaps others as well, GR Ref 2847, 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 an adequate job of representing the item.