Also, I'm not sure there would be much logic in carefully painting around a Werke Nr. when you're slopping on temporary winter camo with a broom or mop. Would there have been a regulation or practical reason to leave the number exposed?
Victory marks, however, would be a matter of pride and carefully preserved in my opinion. But I do also agree with the observation that the narrowness of the patch would make for pretty small victory marks.
Still stumped.