I myself and a customer are looking to buy some hard-to-find
Polyphon discs as below.

Polyphon 41G 24.6 cm or 9 3/4" with 6 bells
  (not same as 9 1/2" discs).

Polyphon 46G 28.1 cm or 11" with 8 bells
  (not same as standard 11" discs).

Polyphon 36 cm or 14 1/2" with 12 bells.

Kalliope 8" and 9 1/2".

Playable discs preferred, but damaged ones also considered if cheap
as they can be copied.  I also have some obscure sizes of disc for
sale or exchange.

Kevin McElhone,
Northampton, England