Hamilton Factory Mainspring for 10s & 12s Hamilton No. 6021 - Steel

Hamilton Factory Mainspring for 10s & 12s Movements, No. 6021, steel, new in frail envelope. See image for precise characteristics. These were available in a couple of different strengths and those that I can supply are shown in the drop-down list. 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 an adequate job of representing the item.