Letter from a prisoner at the German concentration camp at Sachsenhausen, in German on a pre-printed form, 4pp. 8vo., Apr. 6, 1941, from camp inmate Vaclav Lochar to his mother in occupied Czechoslovakia, with the rarely seen transmittal envelope with 'C' to his mother. Lochar, Prisoner No. 14572, Block 48, was a political prisoner, and mentions receiving letters and his relatives, as well as books on biochemistry, etc. Shows a horizontal fold at the center, else very good.