That yellow cross markings are Romanian WW2 markings, from the period the country fought on the Axis side ( June 1941- Sept 1944).The aircraft is a genuine Romanian Ju-88D (WerkNr.430650)which defected in July 1943 from the Eastern front. But the aircraft in the muuseums wears the number(105) of a Ju-88A4.
For details, please see the October 1994 issue of Air International.