I have a client here in central Connecticut with a Steinway upright
Duo-Art from 1916, serial number 177935.  The Duo-Art mechanism has
been fully removed by someone years ago.  It had the steamboat pump
arrangement, because I could see the original mounting blocks still
on the bottom board.

The piano itself is original back to the time of manufacture.  The
pin block is holding well, has original ivories, etc.  An excellent
candidate for restoration and locating a system for it.  The price
is very reasonable. Contact me via email with further questions.

Thank you.
Herbert Lindahl
www.herblindahlpianotuning.com