Cover (philately)

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Commemorative covers that were carried aboard the Pioneer Zephyr for its first revenue run (November 11, 1934) and as it crossed the one million mile mark (December 29, 1939).

In philately, a cover is an envelope or package, typically with stamps that have been cancelled. Complete covers, as opposed to a front or a piece, may be referred as an entire.

The term originates from the practice of covering a letter by folding a separate sheet about it to physically protect and prevent infringement of confidentiality. In the first half of the 19th century it became the fashion to cut the cover into a diamond or lozenge shape. This was the precursor version of the envelope as it is known today. Its popularity was ensured in Britain when the lozenge design was adopted for the special pre-paid postage envelopes and covers issued at the launch the postal reforms of 1840.

A first day cover is typically an envelope with a postage stamp cancelled on its first day of issue. A commemorative cover has a commemorative design and special postmark to mark the date of a specific event.

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