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A real British pound coin, of the old type, on top of a fake.This coin was often counterfeited. Defective milling and letters on a counterfeit coin (top) For modern coins in general circulation, the most common method of protection from forgeries is the use of bi-metallic coins made of two metals of different color, which are difficult to counterfeit at low cost.
Countermarked one yen coin showing the "gin" stamp on the obverse left side. (stamped in Osaka) Countermarked yen refers to Japanese trade dollars and 1 yen coins that are stamped 銀 (gin), literally meaning "silver" (pronounced with hard 'g'). The countermark was added by the Japanese government in 1897 to these coins dated up to that point.
A coin catalog (or coin catalogue) is a listing of coin types. Information may include pictures of the obverse and reverse (front and back), date and place of minting, distribution type, translation of inscriptions, description of images, theme, metal type, mintage, edge description, orientation of the coin, weight, diameter, thickness, design credentials, shape and prices for various grades.
A typical counter of presorted coins uses a bowl with flat spinning disc at the bottom to distribute coins around the bowl perimeter. An opening in the edge of the bowl is only wide enough to accept one coin at a time. Coins either pass through a light-beam counter, or are pushed through a spring-loaded cam that only accepts one coin at a time.
There were only ever 24 of these coins minted, but now only nine remain. 1849 $20 Liberty Gold Coin. Minted in 1849, this rare coin easily falls into the million-dollar club. Made from 90% gold ...
A countermarked, punchmarked or counterstamped coin is a coin that has had some additional mark or symbol punched into it at some point after it was originally produced while in circulation. This practice is now obsolete. Countermarking can be done for a variety of reasons. If the currency is reformed, existing coins may be rendered void.