MHG, there certainly have been a number of Navions registered in Germany -
here's an example which I can recall seeing at a couple of UK events in the past. Don't know if any are still current though.
P-149 resembles the earlier Navions, pic above is a later model.
Great aeroplanes, though per G-INFO only one ever made it on to the G- register which was a TEMCO modified Twin Navion.