CR Mainspring for Waltham 0s Factory No. 2230 - Steel

Charles Robert Mainspring for Waltham 0s, Factory No 2230, steel, tongue end, new in envelope. See image for further details. Hate to sound partial to a specific maker, but CR mainsprings tend to be excellent. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.