GERMAN WW2 LETTER fr. MAUTHAUSEN KL KZ, 1940

GERMAN WW2 LETTER fr. MAUTHAUSEN KL KZ, 1940
EXTREMELY RARE GERMAN WW2 LETTER from MAUTHAUSEN CONCENTRATION CAMP KL KZ, 1940
ESTIMATE PRICE: $250 - $300.
HISTORY of SALES: Recently the same item was sold on eBay for $650, on Invaluable for $2000 (!!) - please see the screenshots. Selling on consignment.
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WIKIPEDIA: The Mauthausen-Gusen concentration camp complex consisted of the Mauthausen concentration camp on a hill above the market town of Mauthausen (roughly 20 kilometres (12 mi) east of Linz, Upper Austria) plus a group of nearly 100 further subcamps located throughout Austria and southern Germany. The three Gusen concentration camps in and around the village of St Georgen/Gusen, just a few kilometres from Mauthausen, held a significant proportion of prisoners within the camp complex, at times exceeding the number of prisoners at the Mauthausen main camp. The Mauthausen main camp operated from the time of the Anschluss, when Austria was annexed into the German Third Reich in 8 August 1938, to 5 May 1945, at the end of the Second World War. Starting with the camp at Mauthausen, the number of subcamps expanded over time and by the summer of 1940 Mauthausen and its subcamps had become one of the largest labour camp complexes in the German-controlled part of Europe. As at other Nazi concentration camps, the inmates at Mauthausen and its subcamps were forced to work as slave labour, under conditions that caused many deaths. Mauthausen and its subcamps included quarries, munitions factories, mines, arms factories and plants assembling Me 262 fighter aircraft. In January 1945, the camps contained roughly 85,000 inmates. The death toll remains unknown, although most sources place it between 122,766 and 320,000 for the entire complex.