Don is right saying that the C-2 or C-4 were upgraded to the C-7 variant not only by adding the bomb rack but also these had replaced the engines with the DB 601N, wheels, landing legs and a couple more pieces. Secondly, its werk nummer is 3100 IIRC. So it means she was completed by the Messerschmitt AG factory as the C-2 at the turn of the year 1939/1940. I agree that the camo scheme with colours RLM 70/71/02/65 and mottling 02/70/71 should be very likely. But it is 1942 and quite a doubtful she still wearing the early camo anyway. Just my two cents.