HR Ev-R-Last Mainspring E486 for Benrus V & Unitas 520 - Steel

HR Ev-R-last mainspring No E486 for Benrus caliber V, Unitas caliber 520 plus perhaps other watches as well, steel, 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.