SOUTH VIET NAM, (Republic of Viet Nam), (Viet Nam Cong Hoa)
Between 1963 and 1976, the National Front for the Liberation of South Vietnam (the NLF or "Viet Cong") issued their own stamps. These were printed in Hanoi. When the Republic of Vietnam was toppled in May 1975, the NFL government became the sole stamp issuing authority, until the reunification of Vietnam one year later. The two stamps in the third row are NLF stamps issued in 1965 and 1976 respectively
REPUBLIC OF NORTH VIET NAM
Many North Vietnamese stamps are roughly perforated, especially issues before 1958. The stamps in the first two rows of the first sheet on the left below are stamps of North Vietnam
Socialist Republic of Viet Nam
The reunification of Vietnam took place in July 1976 and brought about a unified postal service. From the stamps in the third row of the sheet on the left below, all the stamps are of Vietnam post unification.