Trufit Mainspring for A.S. caliber 1138, Gruen caliber 215 - Steel

Trufit Mainspring for AS caliber 1138 & Gruen caliber 215 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 mainspring specifications. 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.