Marco Mainspring #266 for 0s Waltham Factory No. 2220 - Steel

Marco Mainspring #266 for Waltham 0s Model 1891 movements, Factory No. 2220, steel, new in envelope. See images for further details. I likely have several of these so the one you get may differ from the images. I specialize is 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.