This silent film, available for viewing or download from Archive.org, shows Berlin in 1927.
It has some interesting expressionist sequences which were part of the cinema scene in that timeframe, as well as a wonderful overview of that point in the Weimar era.
https://archive.org/details/BerlinSymphonyofaGreatCity
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.