NuTemper Mainspring #918 for 12s CYMA / Tavannes Admiral Pocket Watch - Steel

NuTemper Mainspring #918 for CYMA Tavannes Admiral 12s Pocket Watch, steel, new in frail envelope. See images for precise mainspring specifications. 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.