I love the name because of what the model was trying to compete with: Accu-Bass (P-copy). There were two others marketed in the same years: Rock-Bass (J-copy) & Power-Bass (PJ-copy) I have a mongrel bass with the Rock-Bass body and a Jaguar H 32"-scale neck. It plays very well for no more than I have in it, including upgrade pickups.
The Power Bass was a PJ.