The first edition of "The Disc Musical Box Handbook" by Graham Webb
(Faber & Faber, 3 Queen Square, London, 1971, ISBN 0 571 09378 7)
gives a rather complete list of these discs on the pages 272-298
for the first series (5000-5999) and on  the pages 298-319 for the
second series (50000-50999).

With musical greetings for Steve Greatrex,

Hendrik Strengers
Delft, Netherlands