To Jawslaw Sadlick, Dora-Sangerhausen, from Josef Sadlick, Prague
Front: A white envelope with address written in black ink, with the prisoner's name written in heavier ink and underlined in red. Sangerhausen also underlined in red. Dora-Sangerhausen was a secret production facility for manufacture of the V-1 and V-2 rockets. Upper righthand corner has ripped red stamp of Hitler in profile facing right, with a black circular handstamp over it. A blue Postzensur stamp beneath, along with several pencil markings.
Back: Return address written in black cursive ink on top flap.