Unified Vietnam, 1. Anniversary of the Election for the National Assembly, April 25th, 1977, Michel Nr. 906-909; Four stamps with the nominals of 4 xu, 5 xu, 12 xu and 50 xu were issued in perforation 11.0.
Here is the mint set:
A perforation error is known on the 5 xu value. On this canceled stamp the top margin was left imperforate:
There are also lesser errors as can be seen on this mint pair of the 5xu value where the top stamp is taller than the bottom copy.
Here is a mint pair of the 5 xu value that shows missing perforation holes in the horizontal plain. This was caused by perforation teeth that were broken off.
Detailed scan of the affected area:
A printing/plate error known as the “vanishing leaf “ is known on the 12 xu value. Below is a strip of five that show incomplete lotus leafs on the three stamps to the right:
Here is a detailed scan of the “vanishing leaf” error:
This scan shows part of a block of six stamps that feature the green print on the back of the stamps. The top row was folded down to show the front of the stamps, hence hiding two stamps.
Rare printing error on which both the black and green print run is missing entirely:
This issue a also pretty prone to color offsets or so called “color kisses” on the back side of the stamps. Below are offsets of the gold and green color.
Rare printing error that misses the entire black print run leaving the disc in the background empty:
Here are two mint rows of the 50 xu stamp that shows a significant perforation shift upwards. Also, the perforation slants down towards the right side:
Interesting printing flaw on a strip of four of the 50 xu value. The top two values show a normal black printing run, while the bottom two values show a very light black printing run. 
Kolwitz reported that the 50 xu stamp was issued in two distinct print runs. The second print run was released in June of 1982 as an increase in postage rates made the 50 xu nominal more critical. The second print can easily be identified by the darker yellow color that tends towards the yellow-ochre. Also the flag on the second printing is more lilac-red and not red. Bloks of four of the first printing (left side) and second printing (right side) below:
The top left stamp shows a printing flaw on the left side of the golden disc.
Here is a detailed scan of the printing flaw:
Another printing flaw in the top left of the red flag , this time on the bottom right stamp:
Another printing flaw, this time on the red flag of the right stamp:
Detailed scan of the printing flaw:
Here are two pairs that show a significant passer-shift of the red and black/gold color:
This pair shows a double perforation comb strike on the right stamp:
Postally used block of eight 50xu stamps on a piece cut from a large envelope.
Rare single franking of the 50xu value on a local letter mailed to Can Tho.
Another, rare single franking of the 50xu value on a local letter sent from Ho Chi Minh City.
Mixedf ranking of the 50xu National Assembly stamp together with four 50xu Union World Congress stamps p[aying an overall postage of 2.50D on a registered air mail letter sent from HCM City to An Diana in November of 1983. Note that the bottom right of the Union stamps shows very little of 50 nominal number.
Rare multiple franking of the 50xu value paying a 1 Dong postage on an air-mail letter sent to Czechoslovakia in April of 1980.
Mixed franking of the 50xu National Assembly stamps (2) together with the 60xu Einstein stamps (3) paying an overall postage of 2.80D on an international air mail letter sent from HCM City of Switzerland in July of 1982.
Mixed franking of the 30 xu Sofia stamp plus the 50 xu National Assembly stamp on a post card featuring the Polytechnical Institute in Hanoi paying an overall postage of 62 xu to East Germany in February of 1981.
Rare single franking of the 12xu value used on a local letter from Nhat Rang to Hanoi in September of 1977- Hanoi machine arrival cancel on the reverse.
Another rare local letter using a single franking of the green National Assembly stamp on a letter sent from HCM City to Dalat in September of 1977. Dalat arrival cancel on the reverse.
Rare registered express mail letter sent to Klewitz in August of 1978. It features pairs of the entire set plus other NVN stamps for an overall postage of 4.10 Dong. Fulda arrival cancel on the reverse. Green Fulda custom cachet on the front.
Mixed franking of four of the 50xu National Assembly stamps together with two of the 10D Karl Mary stamps paying an overall postage of 22D on an air-mail letter sent to England in December of 1983.
Mixed franking featuring a nice block of four of the black 12xu value of the Aircraft Shot Down series plus two 1D stamps of the Air Defense series and one 12xu National Assembly stamp for an overall postage of 2.60D. The letter was sent by air mail in May of 1977 to Paris, France.
Very rare registered express mail letter sent to Klewitz in September of 1977. It features a strip of five of the 12 xu value that show the “vanishing leaf” plate error. Errors on postally used cover are very rare. The overall postage amounted to 3.76 Dong. Green Fulda customs cachet in front.
Mixed franking using a mass franking of the 60xu Vietnamese Worker Party stamps (13) combined with five 6xu Five Year Plan and two 5xu National Assembly stamps paying an overall postage of 8.20D on a registered air mail letter sent fromDa Nang to Frankfurt, West Germany in December of 1981.
Rare registered express mail letter sent to Klewitz in July of 1978. The letter carries a block of four of the 12 xu National Assembly stamps plus the orchid set issued in 1976 and 1977. The overall postage amounted to 6.10 Dong. Fulda arrival cancel on the reverse. Green Fulda customs cachet on front.
Mixed franking of three of the 12xu National Assembly stamps together with the Communist Party set plus two 1D Air Defense stamps paying an an overall postage of 2.60D on an air-mail letter sent to Paris, France.
Large registered envelope mailed to Klewitz in June of 1982. It features a mass franking of the 50 xu value of both print runs of this stamp. The overall postage amounted to 12.88 Dong.
Another very rare registered express mail letter sent to Klewitz in August of 1983. It features a mis-perforated block of four of the 50 xu value plus a 50 xu stamp with a missing black print run. Error stamps on postally used cover are very rare. The overall postage amounted to 17.50. Fulda arrival cancel and green Fulda customs cachet on the reverse.
Another rare registered letter sent to Klewitz in November of 1983. It features the 50 xu stamp in a pair with a double perforation on the right stamp plus passer-shifts of the red and gold/black color on the two right most stamps. Error stamps on postally used cover are very rare. The overall postage amounted to 12.60 Dong. Fulda arrival cancel on the reverse. Fulda green customs cachet on the front.
Rare registered express mail letter sent to Klewitz in March of 1979. It features the entire National Assembly set. The overall postage amounted to 4.81 Dong. Fulda arrival cancel on the reverse. Green Fulda customs cachet in front.
Very rare registered express mail letter sent in June of 1978 to Klewitz. It carries a mixed franking that includes one of the 50 xu and three of the 1 Dong stamps. There are also four of the National Liberation Front (Viet Cong) stamps. The currency of the Viet Cong stamps represented the currency of the South Vietnamese Regime and hence was not compatible with the Dong of North Vietnam. Also Viet Cong stamps were, according to postal regulations, not to be used or cancelled in the North. This regulation clearly was disregarded in this particular case. 12 xu National Assembly stamp in front. Ignoring the invalid Viet Cong stamps the overall postage amounted to 5.10 Dong. The red free-frank on front shows “000” but was required to produce the registration label to the left. Red two line hand-stamp applied by the sender that states that the letter was franked by the sender Frankfurt arrival cancel on the reverse. Green Fulda custom cachets on front.
Rare registered express mail letter sent to Klewitz in December of 1978. It features the 12 xu stamp 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.
Rare registered express mail letter sent to Klewitz in August of 1978. It carries a pair of the 12 xu stamps plus a range of other contemporary NVN stamps for an overall postage of 4.40 Dong. Interesting Basel-Frankfurt rail transit cancel and Fulda arrival cancel on the reverse. Green Fulda custom cachet on front.
Another very rare registered express mail letter sent to Klewitz in September of 1978. The letter caries the other half of the im-perforated Sport Games set plus the 12 xu National Assembly stamp. Im-perforated stamps on postally used cover are very rare. The overall postage amounted to 3.56 Dong. Fulda arrival cancel on the reverse.
Another very rare registered express mail letter sent to Klewitz in September of 1978. The letter carries the other half of the im-perforated Sculpture set most of the National Assembly set for an overall postage of 4.45 Dong. Im-perforated stamps on postally used cover are very rare. Fulda arrival cancel and bi-libgual Vietnamese custom sticker on the reverse.
Registered letter sent from Quan 5 to Klewitz in October of 1982. The letter features the entire Nutritional Day set plus the 2 Dong Total Liberation stamp that shows a very significant passer-shift of the yellow printing color. There is also a pair of the 12 xu Lots stamp with the rare Post Master Perforation 15. Error stamps on postally used cover are very rare. National Assembly stamps on the reverse. The overall postage amounted to 11.66 Dong. Green Fulda custom cachet on front.
Registered letter sent from Nguyen Trai to Klewitz in June of 1983. The letter features pairs of the World Congress set. Th right 50 xu stamp shows a deficient print of the black color. The 5 Dong stamp is of different color variations. Also, the left stamp shows a partial failure of the black print. The letter also features four copies of the military free frank that was issued in 1981. Military free franks were not valid for international postage due to their lacking nominal value. National Assembly stamps on the reverse. Nevertheless, it appears that the postal clerk was not familiar with this regulation. The overall postage amounted to 18.08 Dong (including the implied value of 48 xu for the free franks). Green Fulda custom cachet on front.
Registration Nr. 102540
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