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Machin
The name given to G.B. definitives, first issued in 1967 bearing the Queen's head designed from a plaster cast of the queen's profile by Arnold Machin,
Margin
The unprinted edging surrounding or dividing a sheet of stamps. [see Gutter Margin]
Miniature Sheet
(abbreviation M/S) A small sheet of one or several stamps, usually with a decorative margins, issued as a souvenir for collectors.
Mint
A stamp as issued by the government printing office with full original gum [see Original Gum]. where available, unhinged and uncanceled.