From Stamps of the World
Konstanz (English and French exonyms: Constance, Latin: Constantia) is a university city (81,692 inhabitants end 2014) located at the western end of Lake Constance in the south-west corner of Germany, bordering Switzerland. Historically in the Grand Duchy of Baden.
Postmarks in Germany
Postmarks in German Empire
After 31 December 1871.
Postmarks of Grand Duchy of Baden
CONSTANZ was a District and province, code 25. The postmark DE CONSTANCE is known since 1782.