I have three "mystery rolls" I'd like to identify.  They are of
rather heavy card and are 10-1/4" (26 cm) wide,  and look like
they play a mechanical piano or organ with a center drive sprocket.

Pictures attached.  Thanks!

Philip Jamison
West Chester, PA

 [ The cardboard roll has a chain of large round holes, about 7 mm
 [ (.27") diameter, for a sprocket drive running down the middle,
 [ reminiscent of a sprocket drive music box disc.  The note holes,
 [ however, are made with a square punch, just like book music.
 [ I measured the channel distances from the photo and estimate that
 [ the instrument played 61 to 65 notes.  The note spacing is about
 [ 3.7 mm, or 6.85 notes per inch.  I will place the photos at the
 [ MMD Pictures site, http://mmd.foxtail.com/Pictures/  -- Robbie