PM Mainspring for Waltham 0s & 3/0s #2228 - ONYX Steel

PM Mainspring for Waltham 0s & 3/0s movements, Factory No. 2228, ONYX steel, new in envelope. 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 a pretty good job of representing the item.