Well George, this is an old love of yours, so go for it (and let me know once you're out of the game bidwise, because then my predator will no doubt come to life!!!).
To me, this looks like an SG-Z prototype (before they made the endversion of it so ball-less) or a custom shop one off at special request. Those pups are most likely neither sixties nor seventies, but plain Jane TB Plus pups in chrome (which Gibson also produced in small numbers). Not that there is anything wrong with those, they are what's in my gunshot EB-0L and they sound great there.
Good luck!
Uwe