That´s German Flying Ace Rudolph Berthold´s Fokker DVII, although the scale is strange - it looks even larger than 1/48th scale. Might it be a toy/diecast pre-painted model? Those sometimes have even larger scales, I´d guess at 1:45th or even 1:43rd. Why don´t you take the measurements, get the Fokker Stats of the web and do some measuring? I´ve got a 1:48th scale Se5a, which (in real life) was about equal size to the DVII, and that one isn´t nearly as large.
Otherwise, you could repaint it that it looks like a 1920s mail plane. Those were larger, for example in the size class of a Douglas World Cruiser, and some of those looked remarkably similar to a DVII in shape.