Dummy stamp: Officially produced imitation stamp used to train employees or to test automatic stamp-dispensing machines. Dummy stamps are usually blank or carry special inscriptions, blocks or other distinguishing ornamentation.
Dummy stamps - an officially produced imitation stamp used to train employees, test printing equipment or test stamp-dispensing machines.
Dummy Stamps - stamp-like labels either without denomination or with a value shown that has a defacement line through it. Such stamps were used for training and testing purposes. Produced in sheet, coil and booklet format.
Dummy Stamp - Officially produced imitation stamp used for training or testing purposes.
Duplex Cancel - A two-part postal marking consisting of a canceler and a postmark. The canceler voids the stamp so it cannot be reused.
Homepage of the Dummy Stamp Study Group of the United States Stamp Society
[edit] Further reading ...
1: dummy stamps in coil format to test vending machine operation. 2: used by the U.S. Bureau of Engraving and Printing, in 1909 to check internal printing and equipment. 3: exists from private printers. 4: sometimes called testing stamps.
 See also: Used, Definitive, Stamp, Official, Face value
  
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