In philately, an essay is a design for a proposed stamp submitted to the postal authorities for consideration but not used, or used after alterations have been made. Mackay, James. ''Philatelic Terms Illustrated''. 4th edition. London: Stanley Gibbons, 2003, p.50. By contrast, a proof is a trial printing of an accepted stamp. Both essays and proofs are rare, as usually just a few are produced. Although intended for internal use by printers and official bodies, essays sometimes find their way onto the philatelic market.

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