Highway Post Office First Trip Covers

The only mail canceled on the inaugural trip of any highway route was philatelic mail.

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Highway Post Office First Trip cover- Aberdeen, South Dakota to Baker, Montana

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Highway Post Office First Trip cover- between Amarillo, Texas and Roswell, New Mexico

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Motorized Highway Post Office Service cover- Harrisonburg, VA to Washington, DC

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Highway Post Office First Trip cover- between Louisville, KY and St. Louis, MO