North Vietnam, Industrial Workers, August 25th, 1970, Michel Nr. 623-626; Demonstrating the increasing importance of moving from a mostly agrarian to an industrial economy four stamps, all in a 12 xu nominal, were issued in perforation 11.75.
Here is the mint set in blocks of four
Rare registered express mail letter sent to Klewitz in February of 1971. The letter features the entire set plus three stamps from the im-perforated Home and People set from 1969. Im-perforated stamps on postally used cover are very rare. The overall postage amounted to 1.65 Dong which was a tad above the required tariff for a standard 20 gram registered express mail cover to West Germany. 
Rare local letter mailed from Ha-Bac to Ha-Tay in July of 1971. Most local letter sent during the war years were destroyed. The 12 xu postage conforms to the tariff in place at the time. Ha-Tay arrival cancel on the reverse.
Here is a very similar letter but this time directed to East Germany. A nice demonstration that the inland letter rate and the letter rate to fellow socialist countries were identical.
Mixed franking of two 12 xu Industrial Worker stamps plus one 50 xu Fruit stamp paying an overall postage of 74 xu on an international letter sent from Hai Phong to Switzerland.
Registered letter sent from Quan 5 (Cholon) to Klewitz in December of 1981. The letter carries a wide variety of the Lotus stamp (pair in Perf. 9.5 on yellowish paper, pair in 9.5 on white paper, pair im-perforated on yellowish paper, single stamp im-perforated on white paper, pair Perf. 5-6, pairs Perf 11 on yellowish and white paper, pairs Perf. 14 and 15 on white paper and a pair Perf. 14 on yellowish paper). Post master perforations and im-perfroated stamps on postally used cover are ver rare. Two 12 xu Industrial Worker stamps on the reverse. The overall postage (including the free frank for 4.5 Dong) amounted to 7.87 Dong.
Registered letter sent from Quan 5 (Ho Chi Minh City) to Klewitz in January of 1982. The letter carries a strip of three stamps (Michel Nr. 1188). The left stamp shows the plate error “stone at HCM’s foot”. Errors stamps on postally used cover are very rare. Industrial Worker stamp on the reverse. The overall postage amounted to 8.28 Dong.
Registration Nr. 101790
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