PM Mainspring for 10½ ligne Langendorf caliber 36 - ONYX Steel

PM ONYX steel mainspring for Langendorf (LANCO) 10½ ligne caliber 36 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 a suitable job of representing the item.