Unified Vietnam, Membership in the International Telecommunication Union, September 25th, 1978, Michel Nr. 996-997; Two stamps, both in a 12 xu nominal were issued in perforation 11.0. The stamps were printed together within a sheet.
Here is a mint strip of two rows of 20 stamps overall (note that three stamps were folded over) that shows the sheet arrangement. It also demonstrates that the individual images are cliche copies. In the top row the right side of the “V” in “Vietnam” there is a small marking in dark brown. It can be seen on the first and last displayed stamp.
These stamps were not officially released imperforate however a small number of imperforate trial proofs have come to market. Note the much lighter brown background color on the trial proofs as compared to the finally issued stamps.
Rare single franking of one of the 12xu values on a local air-mail letter sent to Ho Chi Minh City in December of 1978. HCM City machine arrival cancel on the reverse.
Rare single franking of one of the 12xu values on a local letter sent from Da Nang to Ho Chi Minh City in December of 1978. HCM City machine arrival cancel on the reverse.
Single franking of the 12 xu value on a domestic letter sent to Tay Ninh in November of 1978.
Single franking of the 12 xu value on a domestic letter sent from Viet Cau to Chi Linh in May of 1979. Chi Minh arrival cancel on the reverse.
Rare registered express mail letter sent to Klewitz in December of 1978. It features multiple sets of the issue plus a range of other NVN stamps from the period. The overall postage amounted to 5.74 Dong. Fulda arrival cancel on the reverse. Fulda green custom cachet on front.
Mixed franking of one of the 12xu stamps together with four 12xu stamps from the August Revolution set paying an overall postage go 60xu on a letter sent to a Vietnamese contract worker in East Germany in March of 1979.
Registration Nr. 102720