Elgin Mainspring for 12s No. 1720 - Alloy

Elgin Mainspring for 12s movements, sold by Cas-Ker, Factory No. 1720 (6082), alloy, new in envelope. See images for further details. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.