The article deals with the introduction of the term timbrology (timbrologie) in relation to the processes of research work with museum articles related to the history of postal communication and to philately. Besides, the author sets the following tasks: to offer an explanation of certain most important timbrological
and philatelic notions to a broad circle of readers; to present some specific features of “extension” of a museum space associated with museum exposure of philatelic material on the example of activity of A.S. Popov Central Museum of Communications; and to try to substantiate the idea of creating a separate section of State catalogue of Museum fund of the Russian Federation, devoted to stamps and postal stationery as unique museum articles, which have their specific features and peculiarities and have no analogs.