Is there a recording of Beethoven's Piano Sonata No. 29 "Hammerklavier" actually played by that instrument?

There are certain orchetras that specialize with playing music on the instruments of the time period. You might want to look up on a Clical CD site for specifics about this: I tried once with Bach's Invention's and put the keyword "-MIDI", because I could only ever find MIDI recordings. Virgin Music, I think has a good selection of clical music.