Marco Mainspring #3244 for Bulova 10BC, 10BCC, 10BS, 10BT, AS 1200, 1201, 1202 - Steel

Marco steel mainspring #3244 for Bulova 10BC, 10BCC, 10BS, 10BT, AS 1200, 1201, 1202, Wittnauer 10S, 11H caliber movements plus quite likely several others. See images for all supported calibers and precise mainspring specifications. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a barely adequate job of representing the item.