All silver coins had 10% copper added to make them harder so they would withstand circulation better. Silver was taken out of circulating US Coins in 1965 with the exception of the half-dollar which continued to be minted in 40% silver from 1965 until 1970.
The US has always used copper in most of its coins. Silver and gold coins had at least 10% copper in them to make the alloy hard enough to resist wear. Large cents were made of pure copper, and bronze cents were 95% copper. Even the lowly "nickel" is actually 3/4 copper.
No year, because U.S. coins are currently made almost entirely of copper. Nickels are 75% copper; dimes, quarters, and halves are 92% copper; and dollars are 88% copper. The only coin that is NOT mostly copper is the cent, which is 97.5% zinc.
The last copper (actually bronze) U.S. cents were struck in mid-1982. Coins from that year exist in both bronze and copper-plated zinc varieties.
All of them were supposed to be made of steel, however there were a few copper coins accidentally struck that year. Its extremely rare to come across copper pennies from that year.
Lincoln cents still have copper in them, but it's a very small amount only .025 copper & .975 zinc. 1981 is the last year all Lincoln cents were made of mostly copper (.950 & .050 zinc) and then in 1982 the Mint issued Lincoln cents made from both compositions. The copper coins weigh 3.11 grams. The zinc coins weigh 2.5 grams.
The US has always used copper in most of its coins. Silver and gold coins had at least 10% copper in them to make the alloy hard enough to resist wear. Large cents were made of pure copper, and bronze cents were 95% copper. Even the lowly "nickel" is actually 3/4 copper.
U.S. one cent coins were 95% copper until 1982. 1982 was the transition year from copper to zinc, so there are copper coins dated 1982 and zinc coins dated 1982. From 1983 to 2012 the coins are 99.2% zinc & .008% copper with a copper plating.
The last copper coins minted by the Royal Mint were minted in 1860. Since then, "copper" coins have been made from bronze which, depending on the year, has a copper content of anything between 92% and 98% copper. More recently, in 1992, the Royal Mint changed from bronze 1 Penny and 2 Pence coins, to more cost effective copper plated steel coins.
No year, because U.S. coins are currently made almost entirely of copper. Nickels are 75% copper; dimes, quarters, and halves are 92% copper; and dollars are 88% copper. The only coin that is NOT mostly copper is the cent, which is 97.5% zinc.
Coins with any copper content may or may not be valuable depending on the country of origin, year of minting, denomination, condition and rarity of the coin, not because of the copper content.
The last copper (actually bronze) U.S. cents were struck in mid-1982. Coins from that year exist in both bronze and copper-plated zinc varieties.
All of them were supposed to be made of steel, however there were a few copper coins accidentally struck that year. Its extremely rare to come across copper pennies from that year.
The last year of the 95% copper cents was 1982. Midway through 1982 the US mint replaced the 95% copper coins with copper plated zinc cents, so there are some 1982 cents that are copper, others are zinc. However, all Lincoln cents prior to 1982 are 95% copper, and all circulation Lincoln cents dated 1983 and later are copper plated zinc.
The first coins of the Third Reich were minted in 1933, the year that the Nazis seized power.
Lincoln cents still have copper in them, but it's a very small amount only .025 copper & .975 zinc. 1981 is the last year all Lincoln cents were made of mostly copper (.950 & .050 zinc) and then in 1982 the Mint issued Lincoln cents made from both compositions. The copper coins weigh 3.11 grams. The zinc coins weigh 2.5 grams.
Copper has never been used as a "filler". U.S. silver coins dated 1964 and earlier are made of an alloy containing 10% copper and 90% silver. Copper is necessary to harden the coins to prevent excessive wear. By itself silver is so soft that the coins would have worn out so quickly as to be impractical for daily use.
The easy way is by the date. 1909 to 1958 (except the 1943 steel coins) are bronze. 1959 to 1981 are a copper alloy that technically is not bronze. 1982 was the transition year from a copper alloy to the zinc cents we now have. Coins of both compositions exist only for 1982 dated coins. 1983 to date are zinc.