I've seen it before.
To me it looks like it's modified. Although the seller says it's not, it just does not make sense that Gibson would have ever built this bass.
Were BadAss bridges even available in 1971? I don't think they were.
The naked fretboard doesn't like like Gibson did it too.
The headstock has bindings. The body has bindings. Why doesn't the fretboard have any?
It would have made much more sense if they had put binding round the fretboard like they did with all Triumh bass guitars.
The wooden pickguard doesn't make sense to me either. Why would they use this instead of the regular laminated plastic?
Why isn't there any typography on it? Why different (non Gibson) knobs?
Di Marzio Model ones were they available in 1971? Dunno.
This is an employee build at best.
But more likely the result of some over-enthousiastic handyman.
Maybe he put a veneer over the top to cover up the holes? When I look at the sides of the control cavity in this pic I think I see the line of the veneer. On the right where the plate meets the top of the body it is clearly visible