I have found an internet site that says this Czech Aero 30 roadster was built in 1994, on a base dating from about 1936, but the coachbuilder is not identified.
Yes, it must be the same site I got it from, which says (translated from German):
QUOTE
The following photo shows a 1994 Aero roadster (built starting about 1936) with a fixed windscreen, external Verdeckspriegeln and special tail shape. This overall design is similar to the Convertible version, which was made by Sodomka (see bottom photo).
UNQUOTE
It's not actually clear though whether it's based on a 1936
car or a 1936
design!
I guessed it was a 1936 car otherwise it would have said what modern mechanics it had.
Solved anyway and maybe an Aero expert can enlighten us..