I'm thinking 1960's? The picture is too clear for WW2, and his wounds wouldn't of had time to heal yet.
WW2 colour was pretty advanced in cases, and the wounds would have plenty of time to heal dude.... Remember, there were Germans in WW2 who got 5, and even more, wounds in combat, and its not like it took the years to recover, they were back in the frontlines in a couple days to a couple months depending on the injury (unless we're talking major like loss of limb or such, in which case they were either discharged, or sent to a training camp as a training officer/sergeant). Also, considering he has a Hindenburg Cross and some kind of Imperial German state award on his ribbon bar, he could have even been wounded in WW1, then wounded later in WW2 to recieve a WW2 silver award.