HR Mainspring SA304 for 18s Hampden No. 1696 - Alloy

HR Mainspring SA304 for Hampden 18s movements, Factory No. 1696, T End, alloy, new in envelope. See images 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 a marginally adequate job of representing the item.