PM Mainspring for 6 ligne Wittnauer caliber 6FF - ONYX Steel

PM ONYX steel mainspring for Wittnauer 6 ligne caliber 6FF 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 pretty good job of representing the item.