Star Mainspring for 16s Rockford early models No. 543 - Steel

STAR Mainspring for 16s Rockford early model Pocket Watch, Factory No. 543, steel. See images for precise mainspring specifications. They're very nice looking mainsprings that are tough to find but their width specifications tend to vary a bit, some are closer to 22½. 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.