Event cover
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Event covers are a type of stamp covers that are created to celebrate an event or note an anniversary.
Soviet special event cover celebrating "Non stop flight from Moscow to Antarctic" (1961)
Cover (philately)
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In philately, the term cover pertains to the outside of an envelope or package with an address, typically with postage stamps that have been cancelled and is a term generally used among stamp and post
Event cover
…Event covers are a type of stamp covers (decorated, stamped and canceled commemorative envelopes) that are created to celebrate an event or note an anniversary. A design (called a "cachet…
1856 cover posted in New York City with three 1-cent stamps affixed
AAT cover commemorating the opening of a post office in 1959
A "Sieger cover", one of the hundreds of covers which traveled to the Moon during the 1971 Apollo 15 postal covers incident