North Vietnam, Successful Battles of the National Liberation Front in South Vietnam, February 16th, 1969, Michel Nr. 563-657; Five stamps in the nominals of 12 xu (three stamps), 40 xu and 50 xu were issued in perforation 11.75.
Mint blocks of four:
Postally used 12xu and 40xu stamps. Postally used stamps are at least ten times rarer than cancelled to order stamps.
Very rare express mail letter featuring the entire set sent to Klewitz in July of 1969. The letter also features the entire im-perforated Titow set and a strip of three of the im-perfroated 12 xu stamp from the reforestation set of 1969. Im-perforated stamps on postally used cover are very rare. The overall postage amounted to 2.34 Dong which appears in excess of the required tariff for a standard express mail letter to West Germany of 1.00 Dong, however, the envelope may have contained a shipment of stamps and hence may have been heavier than the standard 20 grams. 
Philatelic letter featuring the entire set on an air-mail letter sent to Hong Kong in July of 1981.
Registration Nr. 101650
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