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The postcard features a photo of Das Martinstor in Freiburg im Breisgau, a city in the Black Forest region of Germany. The Martinstor is one of the two remaining medieval city gates in Freiburg and is a popular tourist attraction. Freiburg is known for its well-preserved historic old town, including the Münsterplatz (Cathedral Square) mentioned in the text. The postcard was produced by Oberpaur, a well-known department store in Freiburg. The photographer credited is Baumgartner, located on Münsterplatz 18.