J. Mendikow & Co Mainspring for Elgin 12s No. 1712 - Steel

J. Mendikow & Co. "The Universal" Mainspring for Elgin 12s movements, Factory No. 1712, steel, new in envelope. See images for precise specifications. Not very familiar with the maker but notice the nice hand markings on the actual spring. 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 an adequate job of representing the item.