Although possible, it is not likely that the end of the model serial range would have early variation markings? Especially in 1939. One could lightly cling to the idea that they thru the last of all the previous stuff in production right at the end of the year. The problem is that you're lacking other examples of the same variation. Soooo, anytime you have to explain why your Luger is different, it is a distraction and a lowering of the bar from textbook examples???
Doesn't mean it is not possible, again, not likely... best, til....lat'r....GT...