From what i know Gibson in the early 80¨s went back to first three piece Mahogany necks and then one piece. When did they start with the one piece necks? Since they started the weight relief in the early 80´s also did they make any Les Pauls with a one piece Mahogany neck and no weight relief or did the weight relief come before the one piece? I believe they did Les Pauls with the tree piece Mahogany neck and no weight relief. I guess no one knows for sure exactly when the weight relief started. Wonder what the oldest guitar that the owner knows is weight relieved is.