Waltham Factory Mainspring for 3/0s No. 2278 / 2228 - Alloy

Waltham Mainspring for 3/0s Model 1907 movements, Factory No. 2278 / 2228, alloy, new in envelope. This is a pretty uncommon factory mainspring, although it's pretty easy to find in alloy cataloged as a 2228 from other makers. If your 3/0s watch calls for a 2228 in this strength (.13) and you want an alloy, this is the correct mainspring for that application. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate good job of representing the item.