Air-mail registered cover to Germany posted from "ΠΑΤΡΑΙ-ΣΥΣΤΗΜΕΝΑ*1 ΝΟΕ. 36" with exchange control cachet "ΕΛΕΓΧΟΣ ΣΥΝΑΛΛΑΓΜΑΤΟΣ*ΠΑΤΡΩΝ" (type 6, Nr.97a) in violet colou, canc. "ΠΕΝ" (Nr.6) and bilingual tape "CONTROLE DU CHANGE" (Nr.6) with censors signature.