Ohh, very rare. I have one also. I have never seen another one in person, or pictures either. Mine is operator rough, but will be restored someday.
I don’t think 200 were made, I would be surprised if there were 50 made. Probably way less.
I believe taxi was the very first game to have the diamonplate. Banzai was second, And I know for sure they only made 4 diamondplate banzai games.
I don’t think there is good data on the real production run on these Taxis. Decent chance it is well under 10.