Whether you believe it or not - this is Berlin
Regardless if it's day or night...
I really like this division between day and night on this card, the Berliner German is even better or Low German... I have no idea honestly. This makes it even more tricky for me having learnt Standard German as a second language (and I'm by no means fluent!) and so I wrote a loose translation above that should be taken with a grain of salt.
And a "matching" stamp of course! Sanssouci Palace is located in the city of Potsdam, a stone's throw away from Berlin