Allenstein was a district in East Prussia centered upon the city of the same name (currently the Polish city of Olsztyn) which overprinted German stamps in April 1920 to publicize a self-determination vote known as a plebiscite. The name is German for “castle on the Alle River”, construction of which was begun by Teutonic knights in 1347 and completed fifty years later. Since 1999, the … Continue reading Allenstein #25 (1920)