Surtax: The portion of a semi-postal stamp purchase price exceeding the postage value. The surtax is designated for donation to a charity or some other purpose.
Surtax - See "Semipostal."
Sweat box - A closed box containing dampened spongelike material and a grill for holding stamps. It is used to separate stamps from other stamps or envelopes.
Aidez les Tuberculeux: (Fr.) Tunisia surtax overprint semi-postal for tuberculosis.
AIEP: "Association Internationale des Experts Philateliques" (International Association of Philatelic Experts).
A. I. F.
Originally, the 40¢ paid for the nondenominated stamp included 32¢ of postage and 8¢ of charity surtax. When the 1-ounce first-class domestic letter rate went up to 33¢ on Jan.
 See also: Used, Catalog, Catalogue, Stamp, Cover
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