A list of needed stamps or covers, identified by catalog number or some other description, submitted by a collector to a dealer, usually including requirements on condition and price.

Stamps issued under wartime conditions and so designated or inscribed, e.g. the issues of the various factions during the Mexican and Spanish civil wars. It may also be applied to the various War Effort propaganda issues of Canada and South Africa (1942).

Stamp gum designed to adhere to envelope paper only if the gum is moistened. All gummed stamps before 1963 used water-activated adhesive.

A design, device or pattern in paper, generally visible by transmitted light, formed by the dandy roll at the wet pulp stage of manufacture, in which the pressure of the attached bits results in a thinning of the paper. The watermark may serve to identify the paper-maker, but is usually incorporated in the paper used for stamps as a security measure, to defeat the forger. With more sophisticated printing methods in recent years the use of watermarks is dying out. British stamps ceased to use them in 1967. See also Batonne.

A continuous roll of paper used in stamp printing.

Early British stamps from the side of a pane with selvage attached. British sheets printed before 1880 were perforated down the center of the gutter, producing oversized margins on one side of stamps adjacent to the gutter. Such copies are distinctive and scarcer than normal copies.

A paper showing few differences in texture and thickness when held to light. In the production of wove paper, the pulp is pressed against a very fine netting, producing a virtually uniform texture. Wove paper is the most commonly used paper in stamp production.

A flat sheet or strip open at both ends that can be folded and sealed around a newspaper or periodical. Wrappers can have an imprinted stamp or have a stamp attached.

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