Spot On Mel!
During the Spanish Civil War
Fokker supplied (secretly) the Republicans with support in the form of ,apparently, 25 fuselages and 50 wing sets for their
D XXI fighter.
Before these could be produced as full airframes however, the victorious fascist forces over ran the assembly plant.
In later building the Hispano HS-42 trainer, advantage was taken of this and many components of the Dutch fighter were used in its construction. So there we have a bit of technical and political history rolled together, resulting in this Iberian oddity.
Mel - the floor is yours.