South Vietnam, 20 Years Vietnamese Aviation, April 18th, 1972, Michel Nr. SVN 495-502; Eight stamps with nominals of 10D (4) and 25D (4) were issued in perforation 13.5. The stamps of the same nominal were printed together in a single sheet.
Here is the mint set
These stamps were not officially released imperforate, however, a small number of imperforate trial proofs have come to market. Here is the imperforate set in blocks of four that features all four stamps of each denomination.
Enpreuves de Luxe; printed on thin cardboard paper.
Single franking of a 10D stamp on an official domestic letter sent from My Tho to Saigon in February, 1973.
Single franking of one of the 10D values on a domestic letter sent to Saigon in December of 1972.
Single franking of the 10D Vietnamese Aviation on a philatelic letter sent by the Indonesian peace keeping force in Hue sent to a colleague in Binh Duong in May of 1973.
Single franking of the 10D value on a domestic air mail letter sent in October of 1972 from a member of the military (KBC 6534/ARVN 3rd Infantry Division located in Da Nang) to a civilian in Saigon. Cancelled with the mute “Quan Buu” military cancel. Black circular KBC cachet on front.
Multiple franking of the 10D values (4) paying an overall postage of 40D on a very rare domestic express mail letter sent from Saigon to Da Lat in August of 1972. Domestic express mail letters are very hard to find.
Mixed franking of the 10D Aviation stamps (6) together with two 2D Ocean Fish stamps paying an overall postage of 64D on an international air mail letter sent from Saigon to Switzerland in August of 1972.
Mixed franking of the 10D Aviation stamps (4) together with the Asian Productivity stamp paying an overall postage of 50D on an international air mail letter sent by a member of the U.S. Consulate in Hong Kong using a San Francisco military sending address to Hong Kong and mailed in May of 1972.
Single franking of one of the 25D stamps on an official municipal receipt that was sent by registered mail to Cau Muoi in December of 1972.
Sinle franking of one of the 25D values on a registered domestic letter sent from ben Than to a member of the military (KBC 4350) in May of 1972.
Mixed franking of the 100D Wounded Soldier stamp together with a 25D Vietnamese Aviation stamp paying an overall postage of 125D on an international letter sent from Saigon to the United States in February of 1974.
Mixed franking of the Interpol set together with stamps from the 200,000 Returnees, World Telecommunication Day, Vietnamese Aviation, Wounded Soldiers, Emperor Quang Trung, Rural Development, Wax Soldiers, Civil Defense, Craft and Harvest sets paying an overall postage of 340D on a registered intretaional air mail letter sent from Con Son to West Germany in September of 1973. Red Fulda post office cachet on front. Ex Klewitz.
Registration Nr. 201170