Covers: China Image Description History The 50th anni' of the People's Republic of China Navy of China, Han 404, type 091 SSN (prestamped post card)   The 50th anni' of the founding of the people's navy,cover depicting a type 092 SSBN and a seaman with a conventional submarine on stamp, 23.4.1999   Cover depicting the Haikou (type 052 destroyer, Luyang II class), nuclear submarine type 091 SSN, Han class and fast attack gun boats (prestamped cover)