Industry WIKI

Coin cleaning is the controversial process of removing undesirable substances from a coin's surface in order to make it more attractive to potential buyers. Coin cleaning is not advised as it generally decreases its value by removing the coin's patina, the surface valued by collectors. Whether cleaning coins is necessary is a subject disputed among the numismatic community. Those that ar

Coin roll hunting (often abbreviated as CRH) is the hobby of searching and sorting coinage pulled from circulation for collectible coins. This is achieved through obtaining rolled coin, boxed coin, or bagged coin from banks and credit unions. A variant of this practice involves banknotes and is carried out in essentially the same fashion, normally to search for unusual (fancy) serial num

The Croeseid, anciently Kroiseioi stateres, was a type of coin, either in gold or silver, which was minted in Sardis by the king of Lydia Croesus (561–546 BC) from around 550 BC. Croesus is credited with issuing the first true gold coins with a standardised purity for general circulation, and the world's first bimetallic monetary system.

The history of coins stretches back to the first millennium BC/BCE. Notable early examples of coins include the Lydian lion coins, Persian daric and siglos, Tong Bei, the dirham and gold dinar.

Italy has a long history of different coinage types, which spans thousands of years. Italy has been influential at a coinage point of view: the medieval Florentine florin, one of the most used coinage types in European history and one of the most important coins in Western history, was struck in Florence in the 13th century, while the Venetian sequin, minted from 1284 to 1797, was the mo

The history of Thai money used as a medium of exchange and to settle accounts before the adoption of Thai baht coins and banknotes include novel designs and forms. For Thai people, money was considered as the symbol of civilization. Currency itself reflected faith in religion, culture, the customs and traditions of each era and also serve as a record of the development of Thailand.

Notaphily () is the study and collection of paper currency or banknotes. A notaphilist is a collector of banknotes or paper money, particularly as a hobby.

Proof coinage refers to special early samples of a coin issue, historically made for checking the dies (as in demonstrating that something is true) and for archival purposes. In modern times, proofs are often struck in greater numbers, especially for coin collectors (numismatists). Nearly all countries have issued proof coinage.

Scripophily is the study and collection of stock and bond certificates. A specialized field of numismatics, scripophily has developed as an area of collecting because of the inherent beauty of certain historical certificates, and because of interest in the historical context of many of the documents. In addition, some stock certificates serve as excellent examples of engraving. Occasiona

The Standard Catalog of World Coins is a series of numismatic catalogs, commonly known as the Krause catalogs. They are published by Krause Publications, a division of Active Interest Media.

The Standard Catalog of World Paper Money was a well-known catalogue of banknotes that was published by Krause Publications in three volumes. These catalogues are commonly known in the numismatic trade as the Pick catalogues, as the numbering system was originally compiled by Albert Pick, but are also referred to as "Krause" or "SCWPM". Since the mid-1980s the titles have been owned by K

Toning on a coin is the change of colour brought about through oxidization, which forms a thin layer of tarnish on the metal's surface, typically as a result of interactions and chemical reactions with sulfur-containing compounds in the environment. Coin toning can vary in aesthetics, and thus can alternately add or detract from a coin's value. Coins with unusual toning colours or patter