We offer for sale a extremely rare set of 4 letters that belonged to the brother of a famous Polish priest, the priest Maćkowiak, who was also an inmate in KL Mauthausen / Gusen. This man died in Mauthausen in 1942, as we can read in the death notice sent by the Kommandantur of the camp to his family. Letters are in great condition with their original envelopes, as well as correctly stamped with censorship stamp from Mauthausen Gusen camp. A really interesting set from the historical point of view!