Found this interesting character in Tim Pollard's collection:
The body was produced with a number of head variants, for both GW's TSR range and their Oriental Heroes ranges. But thus pinhead version never made it into release. I asked Tim if he was aware of a back-story; he thought that it was an idea to:
"allow extra (full-sized) heads to be sculpted over it. No idea if that was a wind-up though, I have a feeling it was and that it was just a joke in itself..."
So, anyone have any other theories why this fellow might have been sculpted? Was there a pinhead yakuza in some comic book or something back in the '80s?