Star Mainspring for 6s Columbus No. 441 - Steel

STAR Mainspring for 6s Columbus early model Pocket Watches, Factory No. 441, steel. Mainspring could be suitable for other 6s watches as well, including US Watch Co No. 244, although it expects an ever so slightly longer mainspring than this. See images for precise mainspring 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.