Greece 1931, "ΗΡΑΚΛΕΙΟΝ*24.ΜΑΙ.31" first flight registered cover to "PARIS*27.V.31" by IA, commemorative canc. "IMPERIAL AIRWAYS FIRST FLIGHT HERAKLEON (CANDIA) CRETE TO PARIS & LONDON" in red, air-cachet type 15aA in violet. (Hellas FF161C).