See Coins of the pound sterling and List of British coins and banknotes for details. Thus some denominations exist in both coins and banknotes. These coins continue an existing national practice of minting of silver and gold commemorative coins. A total of 98,420,000 coins were minted. Greenbacks were therefore perfect substitutes for gold coins. There were four coffers filled with gold coins as well. The new standard ended the circulation of gold specie coins. One of the first coins to be minted was the croeseid. The Tudors minted the first shilling coins. Zinc is the primary metal in American one cent coins (pennies) since 1982. Actual euro coins and banknotes followed on 1 January 2002. Few of the silver coins being passed were genuine. The Central Bank is unhelpful in providing new condition coins and banknotes. General Rochambeau generously loaned Washington half of his supply of gold Spanish coins. These goods were mostly exchanged for Arabian silver coins, called dirhams.