Sr. Martin Crosta of Argentina writes that he owns a big vertical
Kalliope "caja de musica", with 12 bells, that plays discs of
approximate diameter 23 inches or 62 centimeters.  He has 10 discs
for it, including one that plays the original long version of the
Argentine national hymn.  The instrument has been in his family
since 1900.

How can Martin determine the model number of his musical box?

Robbie Rhodes