The Vistula river mouth looks a bit inaccurate for the time period. The current one was artificially dug in 1891-1895.
I also don't see Gdańsk/Danzig on the terrain map, strange considering other cities, but maybe it was misplaced.
I also don't see Gdańsk/Danzig on the terrain map, strange considering other cities, but maybe it was misplaced.

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