South Vietnam, Inauguration of the new World Postal Union Office (UPU), October 9th, 1971, Michel Nr. SVN 479; A single stamp with a 20D nominal and in perforation 13 was issued.
Here is the mint stamp.
This stamp was not officially released imperforate, however, a small number of imperforate trial proofs have come to market. Here is one from the left sheet margin.
Enpreuve de Luxe; printed on thin cardboard paper.
Mixed franking of the Harvest set in pairs together the Postal Rider set and UPU stamps paying an overall postage of 200D on a rare registered express air mail letter sent from Hue to West Germany. Ex Klewitz. Fulda arrival cancel on the reverse.
Registration Nr. 201100