I have an upright coin operated Polyphon music box with xylophonic bells.
The discs it plays are 22 1/8" in diameter.  When I purchased it about
10 years ago it had several discs of German songs, only one of which I
care for.  I have seen 22.5" discs referred to in books, but have never
seen the actual dimensions of my discs referred to (22 1/8").  Are
22 1/8" discs referred to as 22.5" just to simplify it?  There are two
types of Polyphons.  Those with bells and those without.  Do the
Polyphons with bells require a special disc to actuate the bells or
will one disc play on both types of machines?

Can you refer me to those who sell 22 1/8" discs for my machine?  I
have been watching ebay for 10 years and have never once seen an auction
for a 22 1/8" (or 22.5") disc for my machine, while the 19" discs are
common.  Are Polyphons of the type I have rarities? 

Thank you.

Jim Patrick
Bartow, FL