NuVigor Mainspring #526 for 12s South Bend No. 35528 - Steel

NuVigor Mainspring #526 for 12s South Bend movements, Factory No. 35528, steel, new in envelope. See images for further details and precise mainspring characteristics. Not an easy one to find, most time the closes you can get is a 55528.I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.