Listings in "Specialty Societies" are groups, with national or international membership, devoted to a specific area of stamp collecting, such as air mail, Vatican City, or cancellations.- Category ID : 86260
Group studies covers bearing handstamps, machine markings, labels, manuscript notations, and other indications that the covers received special attention in the mails.
Group dedicated to studying letters, covers, and other mail from around the world publishes a quarterly journal and reference books, and hosts an annual conference in England.
Club promotes the study of the history of ships in the U.S. navy and other maritime organizations and the postal history and postal markings used on those vessels.