I have a '76 P with a serial number fairly close to that and the headstock logo has three Patent numbers on it. But, the neck plate serial numbers were not used in any sense of consecutiveness, so as DT says, it could be a transitional logo from ~mid '76. Everything else about the bass looks to be of that period. And the case is telling - I had thought that the brownish-burgundy interior was "first" used in '77. So, there's some evidence for this being a late '76 to '77 comprised of parts from early '76. I have an "S9" serial numbered neck on my '76 right now, and that headstock looks just like this one less the serial number.
Tuning a mellotron doesn't. - Robert Fripp