Bi-metallic coins are coins consisting of two (bi-) metals or alloys, generally arranged with an outer ring around a contrasting center. Bi-metallic coins are made up of a core with an outer ring. For such a coin to be considered bimetallic, the inlaid or plated parts must coincide in shape on both sides.
The fundamental, distinguishing feature of a bimetallic coin is the existence of different metallic rings, and not the fact that it consists of an alloy containing two metals.Bi-metallic coins have been issued for a long time, with known examples dating from the 17th century, while the Roman Empire issued special-occasion, large medallions with a center of bronze or copper and an outer ring of orichalcum.
Countries with bimetallic coins in circulation. Gold denotes more than one bimetallic coin in use. Red denotes one bimetallic coin in use. Blue denotes that non-bimetallic coin of the same value circulates alongside the bimetallic coin.
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