Hamilton Factory Dynavar Mainspring for 8/0s Hamilton No. 717272 - Alloy

Hamilton Factory Dynavar Mainspring for 8/0s Movements, Catalog No. 717272, alloy, new in frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.