Cover fr. with 10l. yellow-orange on blue and 20l. blue canc. "ΣΥΡΟΣ*4.ΟΚΤ.61", via "ΑΘΗΝΑΙ*6.ΟΚΤ.61", arr. "ΚΑΛΑΜΑΙ*10.ΟΚΤ.61". Cachet "Π.Ε.Δ." in red, the letter was carried by Austrian ship. VERY EARLY USE FOR THE 10 LEPTA VALUE. Very rare and very important. (Hellas 4a+5a).