HR Mainspring No. 838 for Buren caliber 35/12 movements - steel

HR No. 838 steel mainspring for 19 ligne Buren caliber 35/12 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 marginally adequate job of representing the item.