NuREZISTA Mainspring #642 for Hamilton 6/0s Factory No. 2321 - Steel

NuREZISTA Mainspring #642 for Hamilton 6/0s movements, Factory No. 2321, steel, new in frail envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.