Star Mainspring for 16s Columbus No. 249 - Steel

STAR Mainspring for 16s Columbus early model Pocket Watches, Factory No. 249, steel. Mainspring could be suitable for other 16s watches as well, including NYS / Crown No. 1321. See images for precise mainspring specifications.  I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a suitable job of representing the item.