Hamilton Factory Dynavar Mainspring for 8/0s Factory No. 44434 - Alloy

Hamilton Factory Dynavar Mainspring for 8/0s Movements, Grades 747 & 748, Factory No. 44434, alloy, new in envelope. See image for precise mainspring specifications. I likely have several of these so the one you get may vary 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.