Bulova factory mainspring for caliber 6AK, 6BA, 6BC - Steel

Bulova factory mainspring for 6AK, 6BA, 6BC caliber movements, steel, new in sealed envelope. See images for further details. The wonderful thing about factory mainsprings is they always fit! 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.