North Vietnam, Historical Speeches of President Ho Chi Minh, January 30th, 1967, Michel Nr. 467-468; According to Michel some of the two values were printed together in the same sheet in an alternate arrangement row by row. This suggest that the value was also printed individually in proprietary sheets. Both values had a 12 xu nominal. The stamps were produced in perforation 11.0.
These stamps were not officially released imperforate however a very small number of imperforate trial proofs have come to market. Here are two of them.
Small production flaws have occurred. Here is a mint stamp that shows an air blister on the top left of the stamp. The small air bubble prevented the color from covering the entire area leaving an un-inked white circle.
Very rare single franking of one of the 12xu stamps on a local letter (full contents preserved) to Hanoi. Most local letters were destroyed in the multi-decadal war, destroyed by the tropical climate or by recycling due to raw material shortages.
Rare registered express mail letter mailed to Klewitz in March of 1971 featuring a pair of the attached set. The overall franking amounted to 1.72 which was slightly above the required tariff for a registered express mail letter to Wes Germany (1.60 Dong). Fulda arrival canceler on the reverse.
Here is a large letter sent by Xunhasaba, the official distributor of philatelic material in North Vietnam, to Theo Klewitz in West Germany. The letter features the entire perforated wild animal set and a pair of the historical speeches of HCM set. The overall franking amounted 1.94 Dong which was on account f the larger size envelope and the fact that the shipment contained stamps that Klewitz had ordered from Xunhasaba.
Registration Nr. 101430