Here are some historically significant PRS guitars from years past. Click to enlarge photos The Sorcerer's Apprentice from 1982. The SA has a steeper headstock angle than earlier PRS deasigns The SA incorporated non-locking Schaller tuners with the familiar shared D&G screw on the back of the headstock. No serial number. The headstock shape and eagle inlay are in continuous use to this day (although slightly refined) This photo shows the finish sinking around the eagle inlay. It also shows an early PRS string nut and the truss rod cover.