Hello Panosliak,


Hey, a GDR-radio...

I am afraid this scale glass can not be saved anymore.

You could try to get a used one or you ask in forums like this for a 1:1 Scan of the scale glass. Printed in high quality on foil and backed with acrylic glass there is no huge difference to the original one.
Nowadays it should also be possible to use professional poster print services to print it directly on glass. Would be very close to original.

For future projects, there are several methods to stabilize scale glass paint. Using Hair Spray is one of them I read about. Personally, I do not have experience in that topic. But other folks here has.

Best regards,
Christian

Edit: actual eBay offer: rover.ebay.com/rover/0/0/0?mpr…Fulk%2Fitm%2F263590116137

price much too high, no valves, Chassis totally rotten, casing damaged, but scale glass seems o.k. Maybe you can trade...