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Glossary of Philatelic Terms U

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Underprint: A fine printing underlying the design of a stamp, most often used to deter counterfeiting.

Ungummed: A stamp without gum.
 
Unhinged: A stamp without hinge marks, but not necessarily with original gum.
 
Universal Postal Union: An international organization formed in Bern, Switzerland, in 1874, to regulate and standardize postal usage and to facilitate the movement of mail between member nations.
 
Unused: An uncanceled stamp that has not been used but has a hinge mark or some other characteristic or defect that keeps it from being considered a mint stamp. Uncanceled stamps without gum may have been used and missed being canceled, or they may have lost their gum by accident.
 
Used: A stamp or stationery item that has been canceled by a postal authority to prevent its reuse on mail. In general, a used stamp is any stamp with a cancel or a precanceled stamp without gum.
 
UPU: Universal Postal Union. An international organization formed in Bern, Switzerland, in 1874, to regulate and standardize postal usage and to facilitate the movement of mail between member nations. Most nations belong to the UPU.

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