The first copper coins that Boulton minted for the British Government are know as 'cartwheels', because of their large size and raised rims. The Soho Mint struck 500 tons of these penny and twopenny pieces in 1797, and issued further copper coins for the Government in 1799, 1806 and 1807. All together the Mint produced over £600,000 worth of copper official English coinage as well as seperate copper coins for Ireland and the Isle of Man.