South Bend 12s Mainspring for 1st Model #55528 by STAR - Steel

STAR Mainspring for 12s South Bend 1st model Pocket Watch, Factory No. 55528, Steel. Mainspring is suitable for other 12s watches as well, including Rockford and Crown (New York Standard). See images for precise specifications. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.