Cachet
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In philately, a cachet is a printed or stamped design or inscription, other than a cancellation or pre-printed postage, on an envelope, postcard, or postal card to commemorate a postal or philatelic e
A cachet (on the left) commemorating George Washington Carver on a first day cover issued in the United States
George W. Linn's cachet (in the lower left corner) on Harding Memorial issue
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.
Cachet
…frequently made, either by private companies or a government, for first day of issue stamp events or "second-day" stamp events. They are often present on event covers. The first cacheted FDC (first day cover) was produced by prominent philatelist and cachet maker George Ward Linn in 1923, for the Warren G. Harding…
Soviet special event cover celebrating "Non stop flight from Moscow to Antarctic" (1961)