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Were the camo colours on these spray painted or hand painted in the field?
Yes.
To elaborate: As was mentioned, 1943 on vehicles were painted dark yellow at the factory. Units received supplies of Rotbrun and Dunkelgrun paint paste. This had the ability to be thinned with water or solventl such as gasoline. The amount of thinning determined the depth of the color. There were no specific patterns decreed, as we have today with the 3 color Euro pattern or with the old MERDC. Eachunit or even vehicle commander was allowed the freedom to camoflage his vehicle(s) to meet the environment. Paint was applied by spray guns, brush and even brooms. I think I've even read of paint just being splashed on.
So ultimately, with German vehicles, you are almost totally free to choose the pattern you want, or you can get a reference and replicate that.
Bottom line, have fun with it.