A stamp whose colour or shade of colour, or paper, has been changed by chemical or other reaction. The change

A cover saved from a plane, train, or other vehicle with a postal marking explaining the damaged condition.

Stamps, which are produced in roll form for use in vending, stamp affixing or dispensing machines. A coil usually contains

A pair of U.S. coil stamps, showing a coloured line caused by a gap, where the curved printing plate is

A stamplike label produced by a non-governmental body.

A number printed in the margins of British and colonial and some foreign sheets of stamps showing the sequence of

Early stamps of the United States between 1842-1859 denoting the letter-carriers' charges for the delivery of mail to or from

When there are two different perforation measurements on different sides. For example, a stamp of the 1938 U.S. Presidential series

A group of citizens, appointed by the U.S. Postmaster General, to review approximately 50, 000 suggestions for the stamps, which

Another word for gum or glue. Instructions engraved in the margins of sheets of early Great Britain stamps advised: "In

A stamp is said to be "well centred" when the impression lies evenly between the perforated edge on all four

Large labels affixed to insured letters in Colombia and several Colombian States. There are two kinds: 1, value not declared,