been established on the Web, with international membership. Organizations such as the Cinderella Stamp Club (UK) retain hundreds of members interested in a specific aspect of collecting. Social organizations, such as the Lions Club and Rotary International, have also formed stamp collecting groups specific to those stamps that are issued from many countries worldwide that display the organization's logo. Rare stamps Rare stamps are often old and many have interesting stories attached to them. Some include: The British Guiana 1c magenta is the world's most famous and valuable rare stamp. The Canada 12d Penny Black The Canada 10 Cent Montreal Small Queen Pale Milky Rose Lilac First Printing The United States Hawaiian Missionary Issue The United States "Inverted Jenny" (which is actually a printing error) The United States "1-cent Z grill" stamp The United States One Dollar Trans-Mississippi Issue "Cattle in the Storm" – widely considered to be America's Most Beautiful Stamp The Treskilling Yellow The Mauritius "Post Office" stamps The British Penny Red plate 77 Early stamps of the United States are known as classics. Collectors are able to establish the exact position of a stamp on the original sheet of 200 stamps. Rare stamps are often expertized. Some of the most valuable stamps in the world Catalogues Stamp catalogues are the primary tool used by serious collectors to organize their collections, and for the identification and valuation of stamps. Most stamp shops have stamp catalogues available for purchase. A few catalogues are offered online, either free or for a fee. There are hundreds of different catalogues, most specializing in particular countries or periods. Collector clubs tend to provide free catalogues to their members. Notable collectors The stamp collection assembled by French-Austrian aristocrat Philipp von Ferrary (1850–1917) at the beginning of the 20th century is widely considered the most complete stamp collection ever formed (or likely to be formed). It included, for example, all of the rare stamps described above that had been issued by 1917. However, as Ferrary was an Austrian citizen, the collection was broken up and sold by the French government after the First World War, as war reparations. The Tapling Collection of postage stamps was donated to the British Museum from the estate of Thomas Tapling in 1891. It currently forms the Tapling Collection in the Philatelic Collections of the British Library. Several European monarchs were keen stamp collectors, including King George V of the