Duty Plate - The plate that holds the variable design component of a two-part design. Also see key plate.
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Duty Plate. The plate used in the production of bicolored stamps in which the value appears.
Embossing. A process of raising all or part of a design in relief.
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.
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.
printed in quantity and used indiscriminately for any of the participating British colonies. This was done later by printing the country's name and the proper denomination using printing plates created for that specific purpose, called "duty plates." ...
True Duplex stamps have the two elements joined together in one design, such as the spoon and shoe type.
Duty plate - Portion of a postage stamp design containing the postal duty (face value) when printed separately from the frame, head, ...
Duty plate - Portion of a postage stamp design containing the postal duty (face value) when printed separately from the frame, head, or key plate; in particular, the plate used to impress the duty.
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 See also: Stamp, Used, Printing, Plate, Series
  
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