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Rocket Mail of the WorldUnited StatesMcAllen, Texas, USA %u2014 July 2, 1966 %u2014 EZ-68C4Loyal Service Post 37 of the American Legion.This cover used the 1961 25th anniversary cachet, and overprinted it with information commemorating the 30th Anniversary of the first international Rocket Mail flight from McAllen, Texas to Reynosa, Mexico. With N.Y. National Guard%u2019s %u201cMess Hall%u201d on back, below.
