The shape of the blank paper cut out to be folded into envelope form is called the knife.

Lithographic stamps printed in two or more colours are printed from two or more stones. The first stone bears the

The plate bearing a common design for a series of stamp denominations, or for groups of colonial stamps, but leaving

A term used in Plating (which see) where a pair, strip, or block is found to key-up with a position

A term used in Plating (which see) where a pair, strip, or block is found to key-up with a position