Philatelic Glossary - H

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Handstamp
Cancellation or overprint applied by hand to a cover or to a stamp.
Highway Post Office (HPO)
Portable mail-handling equipment for sorting mail in transit on highways (normally by truck). The last official U.S. HPO ran June 30, 1974.
Hinge
Stamp hinges are small, rectangular-shaped pieces of glassine paper, usually gummed on one side. Folded with the gummed side out, the hinge is used to mount stamps. Most modern hinges are peelable. Once dry, they may be easily removed from the stamp, leaving little trace of having been applied.
HPO
Highway Post Office. Portable mail-handling equipment for sorting mail in transit on highways (normally by truck). The last official U.S. HPO ran June 30, 1974.
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