As you can see, it’s been modified. DiMarzio DP404 in the neck and DP192 in the bridge. The 404 is humbucking but sounds plenty single-coil like to me. The outputs are pretty balanced, though the middle position seems to be out of phase and almost unusable without a Rat.
The added tone control doesn’t work. At zero its a kill switch, just above that it’s crackly, and anything above like three is silent. While the positioning does not match the Venus XII it is better placed than I thought.
Between the phase mis-match, non-functional tone control, and tiny pots, this will be getting rewired. The main question is if that will involve a new pickguard to revert it to volume only - my preferred layout. I can’t find any for sale apart from a black 8-hole from Greece, so if anyone has a line on an original guard please let me know.
It could also do with some shielding.
I do seem to be amassing a Vista collection:
The necks on the XII and 6 string seem to be the same apart from the headstock. Wide, somewhat flat but not too shallow or shouldered. Decently comfy.
I’d like a Musicmaster bass but am unconcerned about Supersonics or Jagmasters.
tell me about hoarding... 
. OSG price seems pretty reasonable after seeing what they've sold for elsewhere.