I wonder if owners of Monopol disc boxes could have a look for me and
let me know :-

1. Do you have any sizes of Monopol discs not listed below?

2. What number range or series are the discs that you have ?

14.6 cm /  5-3/4" centre drive lug cut-out plus serrated edge drive.
14.6 cm /  5-3/4"
19.2 cm /  7-1/2"
22.0 cm /  8-1/2"
23.8 cm /  9-3/8"
25.0 cm /  9-3/4"
30.0 cm / 11-7/8"
30.0 cm / 11-7/8"
31.5 cm / 12-3/8"
34.0 cm / 13-5/8"  This size is compatible with Symphonion.
35.5 cm / 13-7/8"
43.5 cm / 17-1/8"
52.0 cm / 20-1/2"
55.5 cm / 21-7/8" (some sources say 55.2 cm).
67.0 cm / 26-1/2"
70.0 cm / 26-3/8"

Thanks, Kevin McElhone
Northants, UK