1871 Belgium cover with 30c (2) tied by Losange 217 of LIEGE to THE ISLAND OF SYROS (PART OF THE CYCLADES) GREECE SENT VIA TRIEST (rare Austria - Germany route ) , showing alongside ”LIEGE 23 MAI” cds and two different PD handstamps, 3 Sgr manuscript credit marking for the Austro-German Postal union ( DOPV) for the forwarding. Reverse faint transit. PRE UPULETTERS FROM BELGIUM TO GREEK ISLANDS ARE VERY RARE.