Grabber/G-3 Bridge Mk. II?
I'd say wishful thinking - If this is truly is by Gibson i'd say this was post Norlin...
As we all know, anything is possible with Gibson. But I'm certainly suspicious. In the second pic, the curvature of the two corners looks different - gives it a home-made look. OK, may be the angle it is photographed at. And brushed nickel? Hardly what 70s Gibson is known for.
If this is a replacement for the Grabber bridge it would have to be seventies... they'd already started phasing it out by the early eighties, so it would make no sense to design a new bridge by then. Could it be something considered for the Victory, instead of the
Gibson wedge bridge? I doubt this too.
Looking at the sellers other listings, he regularly lists items with two or three manufacturers names. If this is a genuine Gibson, why put the word Fender in the title?