No flags but the US stars at tops and undersides ..... and that's not the 'White 7" seen above that was the G-2 variant. The plane with the US flag was the Bf109G-6 WNr.166133 "White or Red 31" , Capt. Constantin "Bazu" Cantacuzino, Grupul 9 Vânătoare , the pic was taken in Italy, August 1944. There is quite a lot of photos of the Bf 109G-6 on the net.
the source: Messerschmitt Bf-109G that were captured by advancing Soviet forces Russia 1943
the source: Captured Bf109G-6 WNr.166133 with american flag
the source: Messerschmitt Bf-109G that were captured by advancing Soviet forces Russia 1943
the source: Captured Bf109G-6 WNr.166133 with american flag