Sandsteel Mainspring for Ingersoll-Trenton 16s No. 1365 - Steel

Sandsteel Mainspring for Ingersoll-Trenton 16s movements, Factory No. 1365, steel, new in envelope. See image for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.