Head Plate - See "Key Plate."
Herringbone Cancels - Any stamp cancel device that cuts a stamp so it can't be removed intact.
Highway Post Office (HPO) - Portable mail-sorting equipment for mail in transit on highways.
Head plate: plate that prints the stamp's central design; named for the monarch's head..
Heads of wheat: name given to pictorial overprints on 1919 stamps of Hungary.
Health: inscription for semi-postal, New Zealand.
Head plate - In a postage stamp printed by two or more impressions, usually in contrasting colours, the portion of the design containing the central portion (which in early stamps generally contained a portrait).
The idea was refined by De La Rue in 1879 when the printing process was split into two through the use of a key plate (or head plate) for the bulk of the design and a separate duty plate for the name of the colony and the value.
 See also: Unused, Stamp, Revenue Stamps, Series, Philatelic
  
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