Kilb-Beck Mainspring #3833 for Elgin 0s - 3/0s No. 2097 - Steel

Kilk-Beck Company Mainspring #3833 for 0s & 3/0s Elgin movements, Factory No. 2097, steel, new in envelope. See images for precise mainspring specifications. Not very familiar with the Kilb-Beck supply house and would love to find them in a catalog somewhere, but they seem like a pretty nice mainspring. 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.