Dang!
An early version of AWACS? How is that radome explained?
When one sees the elegant curvy lines of the wings and two-bladed propellers could say that it is a Piaggio of the golden age...
But it would be painted ivory white and in the background you would see mountains. This seems to be camo-painted.
I would never have a fixed landing gear, is contradictory with the rest of the aerodynamics.
I'll keep looking