Entire letter cover fr. with 20l. blue canc. "36" and "ΕΠΙΔ. ΛΙΜΗΡΑ*22.ΟΚΤ.61" (1 inverted), via "ΑΘΗΝΑΙ*27.ΟΚΤ.61", arr. "ΝΑΥΠΛΙΟΝ*29.ΟΚΤ.61". Very fine and very rare. (Hellas 5a).