Marco Mainspring #3133 for 17 ligne Buren caliber 18/12 movements - Steel

Marco steel mainspring #3133 for 17 ligne Buren caliber 18/12 movements, and perhaps others. 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.