Promotes the collecting and study of the postage stamps, and postal history of the Ottoman Empire and successor states. Includes information about membership, publications and resource articles.

Group focuses on study of postal material from mountainous Asian nations.

Group studies postal issues and history of Denmark, Finland, Norway, Sweden, Iceland, and related territories.

A worldwide society devoted to all aspects of Russian philately.

A specialized stamp site for precancel collectors.

UK contact site for collectors of Greece with membership and event details.

Non-profit organization devoted to the collection, study, and enjoyment of Thai stamps, covers, and other philatelic items. Includes forums, membership details and an application form.

Group studies covers bearing notifications of problems or special services.

Site of the EFÜR in Sweden with sections on forgeries, expert marks, and literature.

International group studies the postage and revenue issues produced during the reign of the British monarch from 1936 to 1952.