I'd like to mention that the paper punch for my Melodian strips (and
presumably for the Sankyo machines) doesn't need a wide throat (long
jaws).  My strips are only 2.75 inches or 69 mm wide, and my special
punch has only a 1.5 inch throat.  You do have to punch high and low
notes from the top and bottom of the strip, respectively.

However, the punch hole diameter must be much smaller than what you can
buy in an office supply store.  So yes, do make sure you buy the punch
along with the box and paper strips.

To repeat my box's scaling: 20 holes spaced 3 mm apart, with 6 mm top
and bottom margins.  Are the Sankyo strips wider?

Mike Knudsen