Red Devils,
Generally, 1943. The vehicles were usually shipped in dark yellow, with indiviual cans
of dk. green and red brown supplied to crews to be applied according to local conditions.
Quite a few vehicles were supplied late in the war painted Panzer gray, i.e. Jagdtiger.
FWIW, there was quite a bit of camo experimenting previous to '39; gray, green,brown in a 'cloud' pattern, etc.
Hope this helps.
Bob
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illegitimi non carborundum