cover 1915-19 XU5 (5), "Prisoner of War." letter sheet and postcards (2) to Egypt, Germany (4), Greece, Italy, Switzerland and Turkey, showing a variety of markings including oval "FREE FROM PRISONER OF WAR/PC/MALTA" (POW-6) in blue and violet, and oval "FREE FROM PRISONER OF WAR/PC/MALTA" (POW-70/74) in red and with numbers "1" in violet, "2" in red, "3" in violet (2) and "4" in red and purple. (9)