North Vietnam, Shoot-Down of the 2,500th U.S.Aircraft over North Vietnam, November 6th, 1967, Michel Nr. 495-496; Two stamps, both with  12 xu nominal was issued in perforation 11.0.

Here is the mint perforated set:

These stamps were not officially released im-perfroated but a handful of im-perforated trial proofs have come to market. Rare.

Small perforation errors did occur like here on one of the 12 xu stamps which shows another horizontal perforation comb strike in the upper third of the stamp.

Postcard with a photo of To-Na depicting a downed U.S. aircraft.

Very rare single franking of the green 12xu stamp on a homemade local letter from Hanoi to Ha-Bay in November of 1967. Hanoi machine cancel. fragment of arrival cancel on the reverse. Most local letters were destroyed in the multi-decadal war, the tropical climate or recycling due to raw material shortages.

Mixed franking of the 12xu Aircraft Shot Down stamp together with two of blue 12xu Production and Defense stamps and the 12xu Morrison stamp for an overall postage of 48xu on an air mail letter sent to Czechoslovakia in 1968. Given that the standard 20g letter rate was only 12xu this letter must have been much heavier than the standard.

Very rare registered express mail letter sent to Klewitz in October of 1968. It features the entire set. The overall postage amounted to 1.58 Dong which was 2 xu shy of the required tariff for a standard registered express mail letter to West Germany (1.60 Dong). Fulda arrival cancel on the reverse.

Registration Nr. 101490

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