July 5-10, Championships of Sopot, Sopot, Germany (Clay)
Sopot and Danzig, now both in Poland, are 2 different towns, about seven miles away.
If the tournament was "Championships of Sopot" was held in Sopot evidently.
Sopot is a part of Gdansk (Danzig) agglomeration. Before the World War II Gdansk and surrounding areas had a status of a free city - a semi-autonomous city-state, and this tournament had a name "The Free City of Gdansk (Freie Stadt Danzig) Championships" and it was played in Sopot. Although Sopot was no longer on a German territory after 1920, in German sources this event was still called incorrectly "The Championships of Eastern Germany".