Sandsteel Mainspring for Hamilton 12s No. 3028 - Steel

Sandsteel Mainspring for Hamilton 12s movements, Factory No. 3028, steel, new in envelope. See images for precise mainspring specifications. These were available in a couple of different strengths an those that I can supply can be found in the drop-down list. 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.