"Key plate" is a stamp term that is applied to a wide range of postage stamps issued by some countries in the British Empire beginning in 1879.
Key Plate - The plate that holds the fixed, basic design component of a two-part design. Also see "Duty plate." ...
Key Plate
One of two parts of special bicolored stamp designs produced for multiple uses. These design elements include the key plate and the duty plate.
Key plate - A basic design of postage stamp issued by a colonial power or other central postal authority within which are spaces for the insertion of different names of territories and different postal duties.
[edit] Key plate stamps
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 ...
Key plate: the printing plate that prints the stamp's design and used in conjunction with a duty plate.
Key stone: the stone where transfers of the key are arranged as needed.
 See also: Invert, Fine, Duty plate, Stamp Collecting, Trans
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