Oflag XXI-B
Szubin-Wieś, German Reich
Oflag XXI-B and Stalag XXI-B were World War II German prisoner-of-war camps for officers and enlisted men, located at Szubin a few miles southwest of Bydgoszcz, Poland, which at that time was occupied by Nazi Germany.
Prison data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).