Hamilton Dynavar 14/0s Factory Mainspring No. 717442 - Alloy

Hamilton Dynavar Factory Mainspring for 14/0s Movements, Factory No. 717442, alloy, new in envelope. See image for precise mainspring specifications. 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.