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2. Paper embossing - Wikipedia

   en.wikipedia.org/wiki/Paper_embossing

   Embossing on an 1886 revenue stamp of Great Britain. Embossing has been used regularly on postage and other types of stamps. The embossed paper of a letter sheet or stamped envelope is called an indicium. Notable early examples include some of the earliest stamps of Italy, Natal, and Switzerland, as well as the early high values of Great ...

3. Impressed duty stamp - Wikipedia

   en.wikipedia.org/wiki/Impressed_duty_stamp

   A 28 December 1905 over-embossing mark in red on a Hong Kong 5c stamp duty revenue stamp Over-embossing dies may be confused with impressed duty stamps as they appear similar. In fact, they are applied to adhesive revenue stamps to cancel the stamp and tie the stamp to the document on which it is placed.

4. Grill (philately) - Wikipedia

   en.wikipedia.org/wiki/Grill_(philately)

   "G" grill on a stamp of the 1869 issue. A grill on a postage stamp is an embossed pattern of small indentations intended to discourage postage stamp reuse.Used in the United States in the 1860s and 1870s, they were designed to allow the ink of the cancellation to be absorbed more readily by the fibres of the stamp paper, making it harder to wash off the cancellation.

5. Seal (emblem) - Wikipedia

   en.wikipedia.org/wiki/Seal_(emblem)

   A seal is a device for making an impression in wax, clay, paper, or some other medium, including an embossment on paper, and is also the impression thus made. The original purpose was to authenticate a document, or to prevent interference with a package or envelope by applying a seal which had to be broken to open the container (hence the ...

6. Embossing - Wikipedia

   en.wikipedia.org/wiki/Embossing

   Embossing (manufacturing), commercial scale embossing of sheet metal; Image embossing, the process to create highlights or shadows that will replace light/dark boundaries of an image; Leather embossing; Paper embossing, the raising of paper and other non-metal products using specific tools to accomplish the task

7. Postage stamps and postal history of the United States

   en.wikipedia.org/wiki/Postage_stamps_and_postal...

   The Post Office eventually adopted the grill, a device consisting of a pattern of tiny pyramidal bumps that would emboss the stamp, breaking up the fibers so that the ink would soak in more deeply, and thus be difficult to clean off. While the patent survives (No. 70,147), much of the actual process of grilling was not well documented, and ...