> Is there a reference source to help identify disc music box models?

The most 'inclusive' book you can get is the "Encyclopedia of Automatic
Musical Instruments" by Q. David Bowers.  At last check the price was
$125.00 plus postage.  I can get one for you if you'd like, or you
can ask at a large local library to see if they have it or can get you
a copy to look at.

Enjoy the Season!

Nancy Fratti - Nancy Fratti Music Boxes
Canastota, New York, USA
http://www.nancyfrattimusicboxes.com/