The collection and study of postage stamps and mail.Image: 8c Stamp Collecting single, 1972.
A person who collects and studies stamps and covers.Image: 50c Franklin D. Roosevelt Examining His Stamp Collection single, 1947.
A trial design, or model, of a proposed postage stamp created for review by postal authorities.Image: 5c Navy artist's model, 1937.
A trial printing of a stamp used to inspect for defects, see which ink color looks best for that particular stamp, or present to dignitaries and government officials.Image: 5c Flag of Poland approved large die proof, 1943.
Official evidence of payment for postal services, designed to be fixed to a piece of mail.Image: 5c Navy Seal of the Naval Academy and cadets single, 1937.
A unit of stamps cut from a larger press sheet to sell to the public or assemble into a booklet.Image: 29c National Postal Museum pane, 1993.
An envelope, card, or wrapper that has been sent through the mail.Image: Cover addressed to Elvis Presley, 1993.
A mark placed on or near a stamp to show the place and date of mailing.Image: Honolulu during Pearl Harbor attack postmark, 1941.
A mark that obliterates a stamp so that it can’t be used again.Image: Peru trial, 1847.