PM Mainspring for Tavannes caliber 38, 41 - ONYX Steel

PM ONYX steel mainspring for Tavannes 10½ ligne caliber 38 & 41 movements and quite likely others, new in envelope. See images for precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.