In the MMD 171110 David Evans asks for the maker of unknown 20-7/16 discs.
Probably they are reproductions made in England from old discs with
unreadable titles.

I have a Komet wall box of that size (without bells) with 7 discs in
different conditions. The center whole has a diameter of ca. 9/16" or
better 19/32" or 15mm. There are 134 wholes for the periphery drive
with 9/32"  or 7mm. The discs have a peculiar detail caused by the
special design of the four combs. It is not the usual double comb
arrangement, but each comb has its own tracking.

If you look at the disc picture, very often you can find two or even
four neighboured tracks of notes, each driving with its hook a starwheel
and that plucking a tooth on one or the opposite comb.  The bass combs
are wider and so the distance of neighboured tracks on the disc is a
little bit larger in the bass section, corresponding to a circle of ca 9-1/2"
or 24cm. The parallel tracks correspond to identical tones.

Perhaps it helps to identify the discs as Komet discs.
Hans Schmitz, Stuttgart