Bi-metallic coins are

coins A coin is a small object, usually round and flat, used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in large quantities at a mint in order to facilitate trade. They are most often issued by ...

consisting of two ('' bi-'') metals or alloys, generally arranged with an outer ring around a contrasting center. Common circulating examples include the €1, €2, United Kingdom £1 and £2, Canadian $2, South Africa R5, Egyptian £1, Turkish 1 lira and 50 kurus, Indian ₹10 and ₹20, Indonesian Rp1,000, Polish 2 and 5 zł, Czech 50 Kč, Hungarian 100 and 200 Ft, Bulgarian 1 and 2 lv., Hong Kong $10, Argentine $1 and $2, Brazilian R$1, Chilean $100 and $500, Colombian $500 and $1000, Peruvian S/2 and S/5, Albanian 100 Lekë, Thai 10 baht and all Mexican coins of $1 or higher denomination. For a more complete list, see List of bi-metallic coins.

History

Bi-metallic coins and medals have been issued for a long time. The

Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...

issued special-occasion, large medallions with a center of bronze or copper and an outer ring of orichalcum, starting with the reign of

Hadrian Hadrian ( ; ; 24 January 76 – 10 July 138) was Roman emperor from 117 to 138. Hadrian was born in Italica, close to modern Seville in Spain, an Italic peoples, Italic settlement in Hispania Baetica; his branch of the Aelia gens, Aelia '' ...

. Meanwhile, circulating bi-metallic coins are known from the 17th century. English farthings from 1684 through 1693 were made of tin with a central plug of copper for value. The silver-center cent

pattern A pattern is a regularity in the world, in human-made design, or in abstract ideas. As such, the elements of a pattern repeat in a predictable manner. A geometric pattern is a kind of pattern formed of geometric shapes and typically repeated l ...

produced by the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

in 1792 is another example. In the 1830s and 1840s, British medalist Joseph Moore produced large numbers of bi-metallic "penny model" and less common "halfpenny model" tokens, as a proposal to replace the relatively large

penny A penny is a coin (: pennies) or a unit of currency (: pence) in various countries. Borrowed from the Carolingian denarius (hence its former abbreviation d.), it is usually the smallest denomination within a currency system. At present, it is ...

and halfpenny coins. Though not

legal tender Legal tender is a form of money that Standard of deferred payment, courts of law are required to recognize as satisfactory payment in court for any monetary debt. Each jurisdiction determines what is legal tender, but essentially it is anything ...

, Moore's tokens were circulated widely and accepted at face value by many merchants. Despite their popularity, the Royal Mint rejected the proposal, and did not reduce the size of the penny and halfpenny until decimalization. The first modern circulating bi-metallic coin was the Italian 500 lire, first issued in 1982. Based on the minting process of the lire coin, A list of All bi-metallic coins can be found here The first ever tri-metallic circulating coins were 20-francs coins introduced in France and Monaco in 1992. These were similar to the corresponding bi-metallic 10-francs coins, but had two rings instead of one.

Use

As well as circulating coins, where they are generally restricted to high-denomination coins, bi-metallic coins are often used in commemorative issues, often made of

precious metals Precious metals are rare, naturally occurring metallic chemical elements of high economic value. Precious metals, particularly the noble metals, are more corrosion resistant and less chemically reactive than most elements. They are usual ...

. For example, the only bi-metallic coin issued by the

is the $10 Library of Congress commemorative, made of a

gold Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal ...

ring around a

platinum Platinum is a chemical element; it has Symbol (chemistry), symbol Pt and atomic number 78. It is a density, dense, malleable, ductility, ductile, highly unreactive, precious metal, precious, silverish-white transition metal. Its name origina ...

center. They are used primarily as a way of securing against coin counterfeiting.

Manufacturing

The manufacturing process is similar to that of ordinary coins, except that two blanks (the inner and the outer) are struck at the same time, deforming the separate blanks sufficiently to hold them together.

Countries

Examples

File:IDR_1000_Koin_2.JPG, Two "Kelapa Sawit" (oil palm) bi-metallic Rp1,000 coins, with the second one being minted in 1996 File:Kingtutcoinobv without background.png, 2008 " King Tutankhamun" bi-metallic £E1 coin. File:1-real-2019-25-anos-reverso.png, Brazilian R$1 coin, a

stainless steel Stainless steel, also known as inox, corrosion-resistant steel (CRES), or rustless steel, is an iron-based alloy that contains chromium, making it resistant to rust and corrosion. Stainless steel's resistance to corrosion comes from its chromi ...

center in a

bronze Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals (such as phosphorus) or metalloid ...

plated steel ring. File:Indian 10 rupee coin (2019).jpg, ₹10 bi-metallic coins from India. File:20franctrimetalrev.jpg, 1992 French 20 francs tri-metallic coin.

References

External links

* {{DEFAULTSORT:Bi-Metallic Coins * Numismatics Bimetal