Hamilton Factory Mainspring for 6/0s Hamilton No. 717202 - Alloy

Hamilton Factory Mainspring for 6/0s Hamilton 17j Movements, Factory No. 717202, alloy, new in envelope. See image for precise mainsporing specifications. These are basically equivalent to the 2521 in steel and are also known by the old Hamilton #27433. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a marginally adequate job of representing the item.