Sandsteel Mainspring No. 2220 for 0s Waltham - Steel

Sandsteel Mainspring for 0s Waltham Model 1891, Factory No. 2220, steel, new in envelope. See images for further details. These were available in multiple sizes and those I can supply are shown in the drop down list. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a marginally adequate job of representing the item.