I don't know how many, but we did make an awful lot of them back in the day. The Vector hasn't been in the brochure since 1996, so that might explain the recent dry spell.
The double P pickups are LOUD. Of course you can turn up the gain on an of the systems we make inside the cavity, but the P are even louder than the rest. mostly they sound they same, since we make the pickups all in a similar fashion. P shape pickups are only for 4-string basses.
Again, I don't know how many were made (the files are actually files in drawers, not in a computer). I will guess about 100 or so with the double P confiuration, but that's just a guess.