Steel Mainspring for CROWN (N. Y. Standard) 3/0s No. 1323

Generic Steel Mainspring for CROWN (N. Y. Standard) 3/0s wrist watches, Factory No. 1323, new envelope. Usually I have some idea who made specific mainsprings but the envelopes don't show a maker, just the information you see here - Dennison 7 x 9. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.