Worlds of David Darling
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cupronickel coins
Cupronickel is an alloy containing 75 parts of copper to 25 parts of nickel, widely used for coins. In 1947 it replaced the silver alloy used until that time for non-copper coins in the UK. Cupronickel is fairly strong and yet resistant to corrosion and abrasion and at the same time readily worked into shape.

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