Illinois Factory Mainspring No. 47380 for 18/0s Models - Steel

Illinois Factory Mainspring for 18/0s Model movements, Factory No. 47380, steel, new in envelope. See images for further details. One of the beautiful thing about factory mainsprings is that they pretty much always fit. 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.