Many modern stamps are printed from two plates, one being the same (the Key Plate) for all values; the other,

The small detachable labels below the Belgian stamps of 1893-1914, which bear the instruction in French and Flemish not to

The original plate or block bearing the design engraved in correct dimension is the original or master die. It is

A letter to be delivered from the office where posted.

A true double transfer is rare in stamp lithography, but apparent or partial doubling of the image on the stone

Named after its inventor, this paper, used for the Mulready and other envelopes, and in rare cases for adhesive stamps,

One or more sides of a stamp may have a double perforation, with space between, or nearly coincident; in the

Some printing inks derived from metallic bases are liable to become impregnated with sulphur. Stamps printed in such inks are

A term for a mail item, which is undeliverable due to a poor address, or where the addressee is deceased

Stamps designed, or appropriated by overprinting, for use of Government departments. The word “Department” or contraction “Dept.” figures on the

Discontinued Post Office

A carefully printed impression from a die. Printed one at a time in a hand press on special paper, or