HR Mainspring #870 for Helvetia caliber 34, 35 Pocket Watch - Steel

HR Mainspring #870 for Helvetia caliber 34, 35 Pocket Watch, steel, new in envelope. See images for precise mainspring specifications. These movements often had many other names such as General. 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.