Air-mail cover to Halle posted from "ΠΑΤΡΑΙ-ΣΥΣΤΗΜΕΝΑ*22 ΝΟΕ. 36" with exchange control cachet "ΕΛΕΓΧΟΣ ΣΥΝΑΛΛΑΓΜΑΤΟΣ*ΠΑΤΡΩΝ" (type 6, Nr.97a) in violet colou, canc. "ΥΕΣ" (Nr.2) and bilingual tape "CONTROLE DU CHANGE" (Nr.15).