People's Democratic Republic of Yemen

The People's Democratic Republic of Yemen was first the People's Republic of Southern Yemen, formed in November 1967. That was created by the merger of the Federation of South Arabia and South Arabia as a Marxist-Leninist state.  File:PR S Yemen flag surch.jpg|1968 1 dinar overprint. File:PDR Yemen traffic.jpg|1977 75 fils change to righthand driving. File:YEMEN PDR trees.jpg|1981 250f trees. 
 * Its first stamps were issued in April 1968, bilingual overprints on Federation of South Arabia stamps inscribed PEOPLE'S REPUBLIC OF SOUTHERN YEMEN with the old arms or flag struck through with a bar.
 * That became the standard stamp inscription on the commemorative issues that followed.
 * In 1971, the official country name and stamp inscriptions became People's Democratic Republic of Yemen.
 * Stamp inscribed Yemen PDR were issued beginning about 1979 with the previous inscription slowly phased out.
 * In 1990, the Yemen PDR merged with its northern neighbor, the Yemen Arab Republic, becoming the Republic of Yemen.

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