13.8.1936.Double-weight air cover from Piraeus to Amsterdam, franked with 2dr. + 3dr. + 8dr. plus 3x7dr. air stamps (Hellas 518+519+526+A25), canc. "ΠΕΙΡΑΙΕΥΣ - ΑΠΟΣΤΟΛΗ ΑΕΡΟΠΟΡΙΚΩΣ * 13.VIII.36", arr. "ΑΘΗΝΑΙ - ΑΦΙΞΙΣ ΑΕΡΟΠΟΡΙΚΩΣ * 13.VIII.36". Postal rate: 8dr. for a letter up to 20g., 5dr. for the next 20g., airmail fee (for Netherlands, from 8.6.1933 to 20.1.1939): 21dr. (up to 30g. - 3x7dr.).