Flat Plate: A flat metal plate used in a printing press, as opposed to a curved or cylindrical plate.
Flaw: A defect in a plate that reproduces as an identifiable variety in the stamp design.
*Flat Plate Press - a press that prints from a flat plate (as opposed to a curved or cylindrical plate). Until 1915 only the Flat Plate Press was used to print stamps.
Flats - Post Office term for large envelopes in the mailstream.
Flat Plate. A form of printing where the plate is flat, in contrast to rotary plate which is curved.
Frank. A marking indicating the right of free postage.
Frame. The border, or outside, portion of a design.
Flat Plate:
Flaw:
A defect in a plate, causing an identifiable variety in the stamp itself.
5: a marginal marking used on flat plates indicating uniform vertical spacing between columns of stamps. This marking was intended to assist operators of perforating equipment.
These stamps were engraved, and printed in sheets of 400, from flat plates about 18"x22".
During the transition between the use of flat plates and curved plates, some definitive stamps were printed using both methods. Often the difference between these can be determined only by careful measurement.
In stamp collecting, rotary-press-printed stamps are sometimes a different size than stamps printed with a flat plate.
Plate: The basic printing unit placed on a press and used to produce stamps. Early stamps were printed from flat plates. Later curved or cylindrical plates were used. See also Cylinder and Sleeve.
 See also: Plate, Stamp, Printing, Used, Sheet
  
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