Waltham Factory Mainspring for 0s & 3/0s No. 2228 - Steel

Waltham Mainspring for 0s & 3/0s Model 1900 movements, Factory No. 2228, steel, new in frail envelope. See images for further details. These came in a couple of different strengths and those that I can supply are shown in the drop-down list. I likely have several of these so the one you get may differ slightly from the images. 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.