Registered cover fr. with 1939 Ionian Islands union complete set of 5 values canc. "ΑΘΗΝΑΙ*21.V.39" (first day of issue) to Belgium. On reverse railway canc. "ΠΕΙΡΑΙΕΥΣ-ΘΕΣΣΑΛΟΝΙΚΗ ΚΙΝ.1Β" and exchange control cachet circular "ΥΕΣ". (Hellas 560/564).