HR Mainspring SA306 for 16s Hampden No. 3696 - Alloy

HR Mainspring SA306 for Hampden 16s Movements, Factory No. 3696, T end, alloy, new in envelope. See image for precise mainspring specifications. 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.