Spurious; fictitious; sham; -- a cant term originally applied to counterfeit coin, and hence denoting anything counterfeit.

A completely fictitious, worthless "stamp," created only for sale to collectors. Bogus stamps include labels for nonexistent values added to regularly issued sets, issues for nations without postal systems, etc.

An unauthorized label purporting to be a stamp  Burélage A stamp's security background: a network of lines or dots in the design

A spurious, pretend stamp.

stamps Fictitious stamp created only for sale to collectors. Bogus stamps include labels for nonexistent values added to regularly issued sets, issues for nations without postal systems, etc. Also refers to issues meant to defraud collectors. (As examples: Huge Numerous releases beautiful "stamps" and overprints of Abhkasia,Altai,Chechnia etc,-and others regions of ex-USSR,Russia, also Staffa, Nagalend, Holy islands,State of Oman etc. )

Counterfeit, spurious (C) Adj derogatory pretended; intentionally false (L)

This is an unauthorised stamps or label.

A fictitious stamp like label created for sale to collectors. Bogus issues include labels for nonexistent countries, nonexistent values appended to regularly issued sets and issues for nations or similar entities without postal systems.