See also Thematic. A postal marking applied by a post office between the originating and receiving post offices. It can be on the front or back of a cover, card or wrapper. A se-tenant strip of three related stamps, often forming one overall design. A basic design of a stamp or a set.
Catalogs use type numbers or letters to save space.
Catalogs show a typical design rather than every stamp with that design or a similar design. A fine printing underlying the design of a stamp, most often used to deter counterfeiting. Ungummed stamps are either stamps issued without gum or stamps thathave been stuck together and subsequently soaked apart, losing their gum in the process. Many countries in tropical climates have issued stamps without gum. 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.