U.S. Mainspring for Elgin 12s No. 2339 - Steel

U.S. Mainspring for Elgin 12s movements, Factory No. 2339, DB&H end, steel, new in envelope. See images for further details. One of the more artistic envelope designs of any I've seen. 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.