I found these bits of postal ephemera...issued by the Postal Administration of France.
A bit of translation:
Receipt for the sender of a postal parcel for a POW.
Destinaire: Name of addressee (POW)
Numero du Prisonnier: Prisoner's ID number
Timbre a date de la gare etc..: Date and location of Postal or Railway office.(sender)
Stalag: Camp number
Pays de destination: Country being sent to
Allemagne: Germany
Stalag IV-C was a German World War II prisoner-of-war camp located in Wistritz, Sudetenland, (now Dubí, Czech Republic), just north of the town of Teplitz (now Teplice)
Stalag IV-G was a German World War II prisoner-of-war camp (Stammlager) for NCOs and enlisted men. It was not a camp in the usual sense, but a series of Arbeitslager ("Work Camps") scattered throughout the state of Saxony, administered from a central office on Lutherstraße[1] in Oschatz, a small town situated between Leipzig and Dresden.
Stalag VII-A (in full: Kriegsgefangenen-Mannschafts-Stammlager VII-A) was Germany's largest prisoner-of-war camp during World War II, located just north of the town of Moosburg in southern Bavaria. The camp covered an area of 35 hectares (86 acres). It served also as a transit camp through which prisoners, including officers, were processed on their way to other camps. At some time during the war, prisoners from every nation fighting against Germany passed through it. At the time of its liberation on 29 April 1945, there were about 80,000 prisoners in the camp, mostly from France and the Soviet Union.
If you Google the Stalag number..you'll find more info on the POW camps...even photos.

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