Sandsteel Mainspring for Hamilton 16s Factory No. 534 - Steel

Sandsteel Mainspring for Hamilton 16s RR Movements, Factory No. 534, steel, new in envelope. See image for precise specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.