North Vietnam, Irrigation, August 24th, 1964, Michel Nr. 327; A single stamp with the nominal of 12 xu was issued. It was perforated 11.0.
Here is the mint stamp.
Postally used stamp. Postally used stamps are at least ten times rarer than cancelled to order stamps.
Rare single franking of the stamp on a letter to Czechoslovakia paying the correct standard letter rate of 12xu.
Registration Nr. 100940