Ключевые слова: automatic, background, black, collectible, collection, collector, communication, companion, correspondence, cosmonaut, cosmos, country, date, delivery, flight, history, isolated, isolation, known, mail, meeting, message, micro, moon, national, object, old, overprint, paper, perforated, perforation, philatelic, philately, post, postage, postal, postmark, print, ramp, rocket, service, stamp, symbol, used, ussr,