HR Ev-R-Last Mainspring E343 for Cortebert 601, 653 & Gruen 126, 127, 179 - Steel

HR Ev-R-Last Mainspring E343 for Cortebert 601, 653 & Gruen 126, 127, 179 caliber movements and likely other similar ébauche watches, steel, new in envelope. See image for precise 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 suitable job of representing the item.