MAKEDONIA,
Welcome to Beoworld ! 
And thanks for looking in here.
Beolit 40 is almost the same radio as the Beolit 39.
F.e. the tone control circuit is a little different and of course also the dial lettering,
reading Beolit 40 rather than Beolit 39.
Actually, a little known fact is that some Beolit 39's actually have "Beolite 39"
in the dial lettering - that is with the extra "e".
Mine is like this.
It's also worth mentioning that some Beolit 39's were made with brown knobs, that's rare to see.
The Beolit 39/40 itself is not as rare as many people think but there is a strong desire
for this model because of its history and ground-breaking design and not many owners
are willing to sell so seeing one for sale is rare.
I know the whereabouts of 10-12 sets of this type plus one that was tragically damaged
in shipping a couple of years ago.
Note: When shipping bakelite radios, it's almost always a good idea to dismount the
chassis from the cabinet and ship separately.
The risk of breaking the bakelite is too great with that heavy chassis inside.
I have collected serial numbers (and other info) for many years (chassis numbers for
the older models), but since the older sets are numbered across the different
models in the order they are built rather than a continous number range for one model
at a time, and because several models were built simultaneously it's very hard to read
anything from this.
How many sets was produced is probably not known but my guess is that there
maybe are 50-70 pcs in the world today. How many is working, I don't know.
Take good care of the set and of course yourself when working. Better safe than sorry.
We don't have too many vintage threads here so do let us know how you get along with the repair.
Your english is fine. 
Martin