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2. Stamp numbering system - Wikipedia

   en.wikipedia.org/wiki/Stamp_numbering_system

   Catalogs typically treat West Germany as part of a single sequence under the name "Germany" while giving East German stamps their own numbers. The definition of "postage stamp" can also be problematic for catalogers. For instance, some countries have issued adhesive labels purporting to be postage stamps, but which had the "cancel" printed ...

3. Scott catalogue - Wikipedia

   en.wikipedia.org/wiki/Scott_catalogue

   The Scott numbering system assigns plain numbers for regular mail stamps, and uses capital letter prefixes for special-purpose types, such as "B" for semi-postals and "C" for airmail. The numbers are generally consecutive; there are gaps among older stamps, where some numbered types were later renumbered, and among newer stamps where Scott has ...

4. Penny Red - Wikipedia

   en.wikipedia.org/wiki/Penny_Red

   The upper corners were occupied by stars. Perforations, in an experimental gauge 16, first came into use in 1850 and were officially adopted in 1854, also in gauge 16. The experimental perforated issue can be distinguished from the general issue as the latter was applied to a stamp that used a different alphabet type for the identifying letters.

5. Rubber stamp - Wikipedia

   en.wikipedia.org/wiki/Rubber_stamp

   A rubber stamp is an image or pattern that has been carved, molded, laser engraved, or vulcanized onto a sheet of rubber. Rubber stamping, also called stamping, is a craft in which some type of ink made of dye or pigment is applied to a rubber stamp, and used to make decorative images on some media, such as paper or fabric. [1] [2] [3] [4]

6. Plate number - Wikipedia

   en.wikipedia.org/wiki/Plate_number

   The plate number is on one stamp out of the number of stamps printed by a single revolution of rotary printing press used to print the stamps. In the example above, which is a closeup of a strip of 1996 "flag over porch" self-adhesive stamps, we can see a plate number comprising five digits, one for each color layer.

7. Coded postal obliterators - Wikipedia

   en.wikipedia.org/wiki/Coded_postal_obliterators

   Detail of a French stamp of 1854 cancelled with a “losange à petits chiffres” number 1152. This number was assigned to Dunkerque. "A11" cancel of Castries, Saint Lucia. Coded postal obliterators are a type of postmarks that had an obliterator encoded with a number, letter or letters, or a combination of these, to identify the post office ...