Rezista Permotone Mainspring No. 260-0 for Bulova 10BC, 10BS, Unitas 180, 185, AS 1200 - Alloy)

Rezista Permotone Mainspring for Bulova 10BC, 10BS, Unitas 180, 185, AS 1200 & Benrus BR caliber movements, plus likely others, alloy, new in envelope. See images for 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 an adequate job of representing the item.