Hamilton Dynavar 16s Mainspring No. 35434 / 717041 - Alloy

Hamilton Dynavar Factory Mainspring for 16s Movements, specifically the 950B and the 992B, Factory No. 35434 (newer number 717041), alloy, new in very frail 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.