Registered cover fr. with 2x10l yellow-orange and 20l/25l light blue 1900 Surcharges stamp, surcharge displaced so that only "Α" printed on the stamp, canc. "ΝΑΥΠΛΙΟΝ*13.ΑΠΡ.901" and boxed "ΣΥΣΤΗΜΕΝΟΝ", arr. "ΑΘΗΝΑΙ-4*14.ΑΠΡ.901". 40 lepta for a registered cover up to 15gr. A very fine mixed franking cover. Rare. (Hellas 124a+133).