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Cachet by the National Highway Post Office Society, which was founded in 1950, and became the Mobile Post Office Society in 1966.14th Anniversary Trip (Trip 2) Southbound, May 4, 1955%u2014%u2014An unknown number of pieces carried.14th Anniversary Trip (Trip 1) Northbound, May 4, 1955%u2014%u2014An unknown number of pieces carried.
