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.
Original gum. A classic stamp that still has part of its original gum remaining is preferred to a stamp that has been regummed or that has no gum.
Original gum: gum that is present in mint stamps & not tampered with.
Oxidation: Darkening of the ink stamps when they come in contact with air and sunlight.
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Original Gum (OG) - The adhesive coating on a mint or unused stamp or envelope flap.
Oxidation - Darkening of the ink on certain stamps caused by exposure.
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*Original Gum - gum on a stamp as issued by the post office.
Overall Tagging - Phosphor tagging that completely covers a stamp, as opposed to block tagging.
OG/Original Gum. The gummed surface on a stamp is the actual gum that was originally applied to that stamp.
Overprint. Any printing over the original design of a stamp. For instance, an overprint that upgrades or changes the value of a stamp.
- Original gum, a stamp having the original adhesive when it was produced, thus these are mint stamps.
- Regummed, a stamp whose adhesive was reapplied; this is usually done by some stamp dealers in order to make it appear complete.
OG means "Original Gum", and is often used to avoid more precise terms. It means the stamp is unused, and has at least some of its original gum, but is probably hinged or heavily hinged.
Partial original gum: unused with some original gum.
Partial perfs: stamps that are perforated in one direction only, vertically or horizontally; collected in multiples.
- Original gum
O/P - Overprint.
Obliterator - Hand or machine stamp used to cancel an adhesive, especially a device other than a cds.
Obsolete - No longer on sale by the Post Office.
As a rule, used stamps with clean backs are much easier to read than mint stamps with full original gum.
Mint stamps are expected to have full, original gum (just as you would get a stamp from the Post Office) for issues prior to about 1935 (it may depend on the catalog, so check at the beginning).
" "Mint" means an unused stamp with full original gum as it was issued, i.e. in the condition that it left the mint. In the case of stamps, of course, the mint is the Bureau of Engraving and Printing or the manufacturer of the stamps.
Scott furthermore notes that unused stamps with full original gum, in most cases, sell for more than copies without gum or with partial gum.
Many of these are easily identified because while they have been postmarked they still retain their original gum. Some postal authorities cancel them and sell them at a considerable discount to the philatelic community.
A stamp that has not been used for postage, and still has its original gum on the back is called "mint".
The stamp gum condition described when the original gum of an unused postage stamp has been deleteriously affected by one or more handling or mounting procedures, to include heavy hinging, gum glazing from mounts, etc. 2.
bearing most of its original gum in undisturbed condition (but hinged at least once).
Positive condition factors include fresh full colour, full original gum on unused stamps, and so on. Damage such as creases, tears, thinned paper, short perforation teeth, toning and so on negatively affect condition.
Condition: The overall appearance and soundness of a stamp or cover. Positive condition factors include fresh full color, full original gum on unused stamps, and so on.
A used stamp is one that has been through the mail and is usually postmarked. Sometimes there is another price in a catalogue for a stamp in Mint condition. A Mint stamp has all its original gum intact as when it was first sold.
 See also: Stamp, Used, Gum, Mint, Perforation
  
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