“Heidelberg. Ein Gruß von der Hirschgasse. Kurz vor der Mensur.” (by drakegoodman)
Printed on reverse: “Heidelberg. Ein Gruß von der Hirschgasse. Kurz vor der Mensur.”
Mensur is the traditional kind of fencing practiced by some student fraternities (Studentenverbindungen) in Germany. A facial scar resulting from a strike is called a Schmiß and was seen as a badge of honour, especially in the second half of the 19th century and the first half of the 20th.