Glossary of Philatelic Terms O
Click on a letter to see the terms beginning with that letter
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Obliteration: A cancellation intended solely to deface a stamp-also called a killer.
Obsolete: A stamp no longer available from post offices, although possibly still postally valid.
Occupation issue: An issue released for use in territory occupied by a foreign power.
Off-center: A stamp design that is not centered in relation to the edges of the stamp.
Offset: A printing process that transfers an inked image from a plate to a roller. The roller then applies the ink to paper.
OHMS: Abbreviation for On His (or Her) Majesty's Service. Used in perfins, overprints or franks to indicate Official use in the British Commonwealth.
Omnibus issue: An issue released by several postal entities to celebrate a common theme.
On paper: Stamps (usually postally used) that are affixed to portions of original envelope or wrapper.
On piece: A stamp on a portion of the original envelope or wrapper showing all or most of the cancel.
Original gum: The adhesive coating on a mint or unused stamp or envelope flap applied by a postal authority or security printer, usually before the item was issued.
Overprint: Any printing over the original completed design of a stamp.
Oxidation: Darkening of the ink on certain stamps caused by contact with air or light.
OG: The adhesive coating on a mint or unused stamp or envelope flap applied by a postal authority or security printer, usually before the item was issued.
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