EL fρ. with 20l. sky-blue canc. "15" and "ΝΑΥΠΛΙΟΝ*10.ΜΑΙΟΣ.71" to Patras. On reverse arrival postmark "ΠΑΤΡΑΙ*12.ΜΑΙΟΣ.71". The letter re-addressed to Athens and posted again with 20l. blue canc. "9". EXREMELY RARE.