PM Merelloy Mainspring for Waltham 0s movements No. 2220 - Alloy

PM Merelloy Mainspring M263 for Waltham 0s movements, Factory No. 2220, alloy, new in envelope. See images for further details. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.