Ord-Hume's "Pianola" book has a picture of this identical instrument
and also a copy of its original advert.  It sold for $40 around 1900
and was a key-top player for an organ (which explains why it has no
dynamic control levers).  According to the text it plays a special
50-note roll 9-3/4 inches wide.

The left hand spool end is rounded like a 65-note piano roll and the
right one is rectangular and slots in the socket you can see in the
photo.  Winding the handle provides the motive force and winds a
clockwork motor which rewinds the roll.

Adam Ramet
http://www.playerpianogroup.org.uk