Secret mark: A minute mark to differentiate between issues.
Self-adhesive: Gum on stamps that fixes just with the application of pressure.
Selvage: The paper present on the margins of stamp sheets.
Secret Mark: A minute alteration to a stamp design added to distinguish later printings from earlier printings by a different firm. Secret marks may positively distinguish genuine stamps from counterfeits.
Secret Marks: Reference area in a stamp's design to foil attempts at counterfeiting and to differentiate issues.
Secret mark - A minute alteration to a stamp design for distinguishing a printing or to deter counterfeiting.
Self-adhesive - See "Linerless." ...
Stamp secret marks or microtext - these are hidden letters, numerical series, and other devices that are included in the stamp’s design.
Secret marks are small design alterations added to distinguish printings unambiguously. These usually take the form of small lines or marks added to clear areas of a design.
Marcas secretas: (Sp.) secret marks placed into the stamp design to guard against forgery.
Marca taiata în jumatate: (Rom.) postage stamp cut in half, a bisect.
Marchand de timbres: (Fr.) stamp dealer.
Magnifying glass: A good magnifying glass is imperative for collectors who are looking for the secret marks found on 19th-century U.S. stamps and for plate and die varieties on other stamps.
They would place secret marks on the outside of the letter that conveyed their message and all the addressee had to do was read the secret message, refuse to accept the letter, and thus not have to pay for it.
 See also: Stamp, Used, Watermark, Perforation, Applied
  
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