National Liberation Front, 85th Birthday of Ho Chi Minh (II), October 6th, 1975, Michel Nr. NLF 59-60; Two stamps in the nominals of 30xu and 60xu (in South Vietnamese currency) were released in perforation 11.0. A similar set was issued in North Vietnamese currency and nominals of 12xu and 60xu and different country name. (Michel Nr. 811-812).
Here is the cancelled to order set.
Registered air mail letter sent in June of 1987 as a mixed currency franking from Ho Chi Minh City to Klewitz. The letter carries stamps that were still denominated in old Dong (Union Congress, Defense and Production, HCM Birthday) and new Dong (Airplanes, Bonsai, National Assembly). There is also a 30D stamp from the National Liberation Front denominated in South Vietnamese Dong. These stamps became valid after reunification but were devalued by 500:1. There are also different color variations of the Union Congress stamps. Imperforate stamps on postally used cover are very rare. The Vietnamese Government conducted a devaluation of the Dong on September 14th, 1985. This meant that all stamps issued prior to this date were only worth one tenth at the time of mailing. The overall postage hence amounted to 19 oD =1.90 nD. plus the stamps in new Dong (43 nD) plus the red free frank for 320 nD plus the NLF stamp 30 SVND: 500 = 0.06 nD for 364.96 nD. Fragment of green Fulda custom cachet on front.
Registration Nr. 200018