Thats one weird sax, for a start are you sure it's a full pearl?? i cant quite make out from the picture but im pretty sure it isn't. The engraving would date it to late 70s early 80s as it says "King musical instruments USA" which would mean it was made in the Nogalis factory in Mexico rather than Cleveland or Eastlake, yes they still offered the gold engraving on the late models, but the one thing that doesent make any sence is the double socket neck which would have been out of production for probably 20 years, all i can suggest is it is a very late one and someone at some point in time replaced the neck and socket from an early one that was damaged, this one should have a standard overslung neck.
Do you have a serial number?