Prince Charles made 94 in season 1. Averaged 29 and must be among the best seasons by a bowler. He has made a 70 as well. Having a look at his season 1, he didn't really bat that much so his average is a little flattering. He still is pretty handy with the bat.
But he didn't do it in a provincial match, did he? What's the best bowling by a batsman in a Provincial game?