Postage stamp collecting

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Definitive World
A large online catalog of definitive stamps. Definitive stamps are smaller sized, produced in large quantities, usually in single color ink, available for an indefinite period of time

Machin Collectors Club
An organization that collects Machin definitive stamps

Jackson, Ron - MachinBase
A database program for collectors of Great Britain machin definitive stamps to use as a reference and organizer

Machin Definitive Stamps
Dedicated to Machin definitive stamps from Great Britain

Machins: Great Britain
A section of a site dedicated to Machin definitive stamps

Arnold Machin (obit)
A biography of the late Arnold Machin, designer of Machin definitive stamps

Machin Stamp Collecting
An informative page about Machin definitive stamps, including a simple checklist

Machin Stamps Interest Group
A small links page for interested collectors of Machin definitive stamps