South Vietnam, National Development Conference of Families and Children, January 14th, 1975, Michel Nr. SVN 582-583; Two stamps in nominals of 20D and 70D were issued in perforation 11.5 (Michel Nr. 582) and 12.5:12 (Michel Nr. SVN 583).
A few of the prepared but not issued stamps were left imperforate and sold this way after the war. Here is the 20D stamp of these imperforate trial proofs.
Enpreuves de Luxe; Printed on cardboard paper.
Mixed franking of the 20D National Development Conference of Families and Children stamp together with the 5D Sights stamp paying an overall postage of 25D on a domestic letter sent from Vinh Long to Saigon in January of 1975. Illegible transit/arrival cancels on the reverse.
Rare multiple franking of the 70D value on an international air mail letter sent from Saigon to the United States on April 17th, 1975. This was just thirteen days prior to the Fall of Saigon.
Here is the official order from the Commander in Chief of the Pacific Forces (CINPAC) that informs about the closure of the U.S. Embassy in Saigon. The flash notice is dated April 26th, 1975 which is four days prior to the final evacuation.
Below is the fabled cover (ex Klewitz) that carries to postal used samples of the 10D Nguyen Van Thieu stamps (the only one known to carry two postally used copies of these stamps) and stamps from the Traditional Vietnamese Theater, Victory at Quang Tri, New Year, Cultural Places, National Development Conference sets plus the various overprinted stamps for an overall postage of 752D on a very rare registered express mail letter sent from Saigon to West Germany in March of 1975. Red Fulda Post Office arrival cachet on front.
Registration Nr. 201490