Hi Radionut,
There are one or two on-line sellers of repro dial scales, eg. Radio Daze (https://www.radiodaze.com/reproglassdials.htm) – worth checking-out. It is possible to reproduce dials yourself if you have a pattern (like your broken glass scale) – scan the old one and use photoshop (or similar software) to tart up the scanned image (see post on this subject elsewhere on this forum) and then print onto decal paper or clear plastic film (this can be mounted behind a piece of plain glass or Perspex). The only other way I can think of for you to obtain a replacement is to keep a watch for the same model radio on Ebay/fleamerkets etc and use as a doner set – this can take some time for less-common sets though….
Gerry