GERMAN WWII POSTAL RECEIPT fr. ORANIENBURG KL, KZ

GERMAN WWII POSTAL RECEIPT fr. ORANIENBURG KL, KZ
RARE GERMAN WWII POSTAL RECEIPT from ORANIENBURG CONCENTRATION CAMP, KL, KZ, 1942
60 RM has been sent to Gruszezynski Bohdan with prisoners number 30553. We bought six (6) receipts from the 'Oranienburg' concentration camp and dated 1941-1942. All funds were sent to the same inmate.
It is a rare document and has never been published.
TEST: The item is passed very important test: it does not glow under a black light. All modern paper glows under a black light - please see the images.
The item is bought from famous USA auction - it is confirmed one more time authenticity of the item - please see the screenshot. Selling on consignment. Please note: last image is for sample only and for sell is only one receipt.
ESTIMATE PRICE: $250 - $300.
HISTORY of SALES: A few years ago the same receipt for the prisoner in concentration camp was sold on eBay for $400 - please see the screenshot.
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WIKIPEDIA: Nazi Germany maintained concentration camps (German: Konzentrationslager, KZ or KL) throughout the territories it controlled before and during the Second World War. The first Nazi camps were erected in Germany in March 1933 immediately after Hitler became Chancellor and his Nazi Party was given control of the police by Reich Interior Minister Wilhelm Frick and Prussian Acting Interior Minister Hermann Goring. Used to hold and torture political opponents and union organizers, the camps initially held around 45,000 prisoners. Heinrich Himmler's Schutzstaffel (SS) took full control of the police and the concentration camps throughout Germany in 1934-35. Himmler expanded the role of the camps to hold so-called 'racially undesirable elements', such as Jews, Romanis, Serbs, Poles, disabled people, and criminals. The number of people in the camps, which had fallen to 7,500, grew again to 21,000 by the start of World War II and peaked at 715,000 in January 1945.