In the recent message written by Terry Smythe, it is mentioned that
..."if it really is 1906, then ......at best it may be a 65/88 foot
pumper". Then later in the same message, he goes on to say that ...
"with a few 65/88 in that 1912 transitional year..."  To the best of my
knowledge, I believe the so called transitional year was 1910 and in
fact several player manufacturers made pumpers which had two tracker
bars - one for each roll standard. This allowed the pianolist to play
either type of roll on the same player piano. (I have one,  a  Knabe ~
Angelus and have written an article about it - will be published in
MBSI later this year)

Best Regards, Joe