HR Mainspring A204 for Hamilton 16s Factory No. 534B - Steel

HR Mainspring A204 for Hamilton 16s movements, Factory No. 534B, new in envelope. See images for precise 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 pretty good job of representing the item.