Schmidt's Music Rolls has a great catalogue of Rolmonica Rolls.
Visit http://www.actionwebcreations.com/smr/catalog.htm or e-mail
to <eschmidt@crosslink.net>,

Probably Ed Schmidt can answer your other questions too.  He gave
me some good advice.  By the way, a Rolmonica is made of Bakelite,
I think.

Good luck,
Leon Monne'