Hi,  I was searching under "coin pianos" on Netscape, and I found
something called the "coin-op yellow pages", which is at
http://randyfromm.com/amusements/yellowpages/

I found a website for "Marvins Marvelous Mechanical Museum," which
shows pictures of an Encore banjo among Mutoscopes and pinball
machines.  The URL is http://www.marvin3m.com/, and the museum is
in Farmington Hills, Michigan.

It had a link to the unusual museum website, which includes a
mechanical organ history site!  It has lots of pictures as well
as sound files (in MIDI format).  The address is
http://w1.telia.com/~u13101111/organs/index.html

I recommend all the sites above.

sincerely,
Andrew Barrett