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.
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.
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.
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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00 35 295 PNS (bot #1176), some OG, HR VF 24.00 36 329 PNS (top #3505) F 33.00 11 375 PLT NO. STRIP of 3, RS #5626, top stamp has thin and two short perfs F-VF 18.00 37 406 PNS (top #6513), HR VF 6.00 38 406 PNS (top #6838), HR, one short perf VF 5.
Unused stamps with full original gum (OG) on the back are worth more than stamps without gum, or stamps without complete gum, for instance those that have been mounted using a stamp hinge.
 See also: Stamp, Plate, Printing, Gum, On paper
  
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