IT was one hell of a hard thing I guess, since the guy who designed this one only designed one other aircraft.
So, all the hints together, with some extra ones...
- aircraft from the '30s
- only 1 built, been fitted with 2 different engines
- tandem 2-seat trainer, built for a dutch student organisation
Well, if it hasn't been found by tomorrow, I guess I should post the answer
And no, it isn't a PWS 40