Cover (envelope) canc. "ΑΘΗΝΑΙ*17.ΜΑΙΟΣ.1849" (type ΙΙ), 3-line cachet "ΔΙΕΥΘΥΝΤΗΣ/ΤΩΝ Β/ΤΑΧΥΔΡΟΜΕΙΩΝ", arr. "ΝΑΥΠΛΙΟΝ*18.ΜΑΙΟΣ.1849. Very rare.