Nice bike. Pity we don't see the other side.
I'm not familiar with these bikes, but looking at the head lamp it seems early or mid thirties at the most.
Here are some pictures that I have collected, the bike is probably a KR6. The Victoria Bikes came as a KR25, KR35 and the KR6 which I would guess were their CC. eg. 250, 350 and 600. The Victoria was the mainstay of the Reichswehr and was being phased out at the beginning of the war, though some saw action with Romanian troops. The other major players being BMW, NSU and Zundapp.