Trufit Mainspring for Bettlach caliber 1297 - Steel

Trufit Mainspring for Bettlach (EB) caliber 1297 movements, steel, new in envelope. B&C Trufit mainsprings were distributed by Barton & Chase of Philadelphia but as you can see were made in Switzerland. See images for precise characteristics. 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.