Thank you so much for all of the info...!There is a post on the Cabe that states the 500,000 bike was produced 1930/31 and the 600,000 around 1941. That puts your bike near the end of that timeline closer to '41 then '31. It seems like it is prewar but as for an exact year that could still take some searching around. If you spend some time on the Cabe you could find some better info I'm sure. Good luck and killer bike.
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