1942 Formula Lettersheet From KZ Mauthausen in Austria

Scarce 1942 formula lettersheet from Mauthausen concentration camp in Austria to occupied Czechslovakia (Bohemia and Moravia). The lettersheet folds into a cover with instructions to the sender. Mauthausen was a also brutal camp, with several sub camps. Light censor markings over instructions. Uses hitler 12pf stamp. Reverse of letter has inmate's name, number, block and DOB. Overall good condition.