Bi-metallic coins are coins consisting of more than one metal or alloy, generally arranged with an outer ring around a contrasting center. Common circulating examples include the €1, €2, British £2, Canadian $2, South African R5, and Turkish lira.

Bi-metallic coins have been issued for a long time, with examples known dating from the 1600s, while the Roman Empire issued special occasion, large medallions with a center of bronze or copper and an outer ring of orichalcum, starting with the reign of Hadrian. The silver-center cent pattern produced by the United States in 1792 is another example. In recent times, the first circulating bi-metallic coin was the 500 Italian lire, first issued in 1982. France, with a 10 franc coin and Thailand, with a 10 baht, issued bi-metallic coins for circiraulation in 1988. India has released 10 Rupee bimetallic coins in 2009 that contains dateline of 2006 (minted at Noida)

Indian Rs 10 Bi-Metallic Coin

As well as circulating coins, where they are generally restricted to high denomination coins, bi-metallic coins are often used in commemorative issues, they are used as a way of securing against coin counterfeiting.

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.

From Wikipedia under the GNU Free Documentation License
Sun Dec 6 20:08:51 2009

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Reverse of 1997 Gold Britannia Modern Bimetallic Gold Two Pounds

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New Issue E V Ramasami C V Raman Rukmini Devi Issue Date 11 05 2009

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flag motif 1997 1997 proof KM 83 Two Pounds bimetallic Guernsey flag motif 1998 2003 2006 KM 82a Five Pounds silver gold cameo 80th Anniversary RAF 1998 proof only KM 91 Five Pounds bimetallic Millennium 1999 copper nickel nickel brass KM 100a Five Pounds silver gold cameo

From Yahoo Image Search: "Bimetallic Coins"
Sun Feb 14 19:40:21 2010

See also:

  • Alwin C. Carus Coin CollectionAlwin C. Carus Coin Collection
    hillsdaledigital.cdmhost.com
    Digital images and descriptions of ancient, world, and U.S. coins presented by Hillsdale College.
  • H.I.P. Pocket ChangeH.I.P. Pocket Change
    usmint.gov
    The US Mint's interactive official site for coin collecting kids. The history of coin minting and what new quarters are due to be minted.
  • Coin Community ForumsCoin Community Forums
    coincommunity.com
    Educational coin collecting forum. Free registration required to post.
Custom search only Bimetallic Coins sites:

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Sat Mar 6 13:47:05 2010
Turkmenistan Takes the Next Step - NumisMaster.com
news.google.com
Turkmenistan Takes the Next Step

NumisMaster.com

According to the central bank, these will be [ringed] bimetallic coins that are made of several metals brass, nickel, and copper. ...
Turkmenistan circulates new 1 and 2 manat coins - ISRIA
news.google.com
Turkmenistan circulates new 1 and 2 manat coins

ISRIA

According to the Turkmen State News Agency citing the Central Bank of Turkmenistan, new bimetallic coins were minted by the Royal Mint of Great Britain. ...



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Krugman's China Hit-Job Is More Blame-The-Victim Nonsense - The Business Insider
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Krugman's China Hit-Job Is More Blame-The-Victim Nonsense

The Business Insider

A century earlier, the currencies of all other major Western countries in 1821 were either bimetallic or specie-backed paper money. ...



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From Google News Search: "Bimetallic Coins"
Wed Jan 20 05:41:27 2010

Turkmenistan 2010 bimetallics
coinsblog.net
Turkmenistan 2010 bimetallics

admin

Wed, 04 Nov 2009 23:30:57 GM

Submitted by World . Coin. News New . bimetallic coins. in Turkmenistan planned for 2010: Images taken from this great site: LINK: . Coins. of CIS and Baltic countries Visit 1800blogger to see all of our industry leading blogs.

Ronald Reagan Commemorative Coins Proposed
coinlegislation.com
Ronald Reagan Commemorative Coins Proposed

admin

Wed, 29 Jul 2009 22:56:01 GM

dollar introduced in 2008 (Ronald Reagan Centennial Act). There have also been two commemorative . coin. program proposals in 2005 and 2006, which would have created $5 gold, $1 silver, and $10 gold and platinum . bimetallic coins. . ...

2008 Nelson Mandela 90th Birthday bi-metallic 5 Rand Coin ...
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2008 Nelson Mandela 90th Birthday bi-metallic 5 Rand Coin ...

foxlachs

Fri, 19 Dec 2008 11:30:27 GM

There has been much debate around the legality of the trading of the 2008 Nelson Mandela 90th Birthday . bi-metallic. 5 Rand . Coin. . To clarify, there is no law that exists in South Africa that permits citizens to sell . coins. or currency for ...

From Google Blog Search: "Bimetallic Coins"
Sat Nov 28 04:23:05 2009