I've written to Gibson Customer Service about this. Let's hear what they say.
Something about the headstock seems wrong to me, the lack of a serial number is astonishing, but the way the back of the neck and the body have been finished is very Gibsonish, the last run CMT RDs come to mind. Also the three point bridge and the short scale harken back to what Gibson has done previously with custom shop or at least one-off Explorers. And then there is the volute though that would date the bass more eighties than nineties (that maple top is ZZ Top inspired which would date it around that time too).
If this has a serious chance of being real (there will be no certainty in any case), I will put a bid in.
Uwe