I have already shown these bills in a thread about III. Reich related money, but they are for sure also interesting for collectors of Polish militaria. All these paper money are in Polish language, and were issued for use by imprisoned officers and soldiers only, in each Oflag separatly. Printed and issued by Polish officers - not by German authorities, but with their permission. Money of Oflag II C Woldenberg, Oflag Gross Bron and Oflag VII A Murnau are known.
References: Lance K. Campbell " Prisoner of War and Concentration Camp Paper Money of the 20th Century", Andrzej Podczaski " Katalog papierowych pieniędzy zastępczych z ziem polskich, tom V, okres 1939-1960"
Information about related camps: