A stamp catalog (or stamp catalogue) is a catalog of
postage stamp types. Although basically just a list of descriptions and prices, in practice the catalog is an essential tool of
stamp collecting.Originally catalogs were just dealers' price lists, and in some cases, such as
Stanley Gibbons, that is still one of their functions. Over time, as
philately developed, catalogs tended to accumulate additional supporting details about the stamps, such as dates of issue, color variations, and so forth. As their use by collectors became widespread, the catalogs came to define what was and was not a legitimate stamp, since collectors would avoid stamps not described in their catalog.
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