Found one of these at the airshow, too.
This nifty Beechcraft was offered to the US Armed Forces as a replacement for the T-6 Texan trainers after World War Two. The Air Force and the Navy used them well up into the 1970s, and there are still quite a few kicking around. It's one that I'm looking at as a possible Cessna replacement down the road. It's kind of a two-seat aerobatic Bonanza.