I ran across several fan-fold music books, perforated by Arthur
Prinsen, that most likely were for playing on crank organs. They
measure 5 inches by 6-1/2 inches by several inches thick, of heavy
cardboard.

I measured 6 perforations per inch so they probably played on
26-28 size key frames. The home-built organ (long gone) using the
books had 67 pipes.

I'd like to know which organ these books possibly were made for.

Alan Fox
Santa Maria, California