Koppel Supply Co. Mainspring for N.Y. Standard 3/0s No. 2041 - Steel

Koppel Supply Co. Mainspring for 3/0s New York Standard, Factory No 2041, steel, new in envelope. I'd never seen this distributor before acquiring a few earlier this year and I love that their mainsprings are full of PEP. 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.