Sandsteel
Sandsteel Mainspring for Hamilton 12/0s Factory No. 4128 - Steel
Sandsteel Mainspring for Hamilton 12/0s Factory No. 4128 - Steel
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Sandsteel Mainspring for Hamilton 12/0s movements, Factory No. 4128, steel, new in envelope. See images for precise mainspring specifications. 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.