North Vietnam, 50 Years Mongolian Peoples Republic, December 25th, 1971, Michel Nr. 682; A single stamp with a 12 xu nominal was issued in perforation 11.0.
Here is the mint stamp.
Mixed franking of the 12xu Mongolian stamp in a pair together with the 50xu Satellite stamp for an overall postage of 74xu on an air-mail letter sent from Hanoi to France in January of 1972.
Registration Nr.101980
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