Entrance of the Blue Grotto Island of Malta Description - The Blue Grotto and the adjoining caves take their colors from the brilliant reflections of theunderwater vegetation. Boat in the foreground with visitors. Details: written in German, dated 1984 posted to the Federal Republic of Germany, postmarked Sliema 1985, 3 Maltese stamps, one for 1c, two for 3 cents showing Monsignor De Piro Item: wied-iz-zurrieq-0002 Price: 4.50 EUR