USR Mainspring for Waltham 18s No. 2222 - Steel

USR Mainspring for Waltham 18s Model 1892 Pocket Watches, which does include the Vanguard model indicated on the envelope, Factory No. 2222, new in envelope. Because the envelope is either open or torn they're dusty so they'll need a good cleaning before, but all mainsprings should be cleaned before use anyhow. USR is short for Ulysse Sandoz-Robert of La Chaux-de-Fonds, Switzerland. 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.