Patrick,  The Musical Box Society International has the Regina
records.  If you send the serial number to Bob Yates he can send
you a certificate with the information you need.  I think there is
a small fee.  Write to Bob Yates at rsublima@juno.com.geentroep
[delete ".geentroep" to reply].

Regards,
Craig Smith

P.S.: You mentioned that the museum is restoring a "Regina nickelodeon".
So I'm wondering just what sort of machine they actually have.  Regina
made music boxes, but maybe this is a coin-operated music box rather
than a nickelodeon, which is usually a piano type instrument.  Can you
please send a picture?

P.P.S.: By the way, restoring a music box is not the project for a
do-it-yourselfer.  If the person responsible isn't familiar with music
box restoration, they might do well to ask for some help before they
make a very expensive mess.