<P> The United States Mint has minted over 20 different kinds of coins, of many different sizes . Often, it is difficult for people to get a grasp of what much of the historical coinage looked like, at least in relation to modern circulating coins . This chart shows all of the coin types, and their sizes, grouped by coins of similar size and by general composition . </P> <P> Seven distinct types of coin composition have been utilized over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum . The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper / nickel (for 3 and 5 cent coins). Copper / nickel composition is also used for all modern "silver" coins . </P> <Table> US Coin Sizes and Composition <Tr> <Th> Steel Alloy </Th> <Th> Copper </Th> <Th_colspan="2"> Copper Alloy </Th> <Th> Silver Alloy </Th> <Th> Silver </Th> <Th_colspan="2"> Gold </Th> <Th> Platinum </Th> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> </Td> <Td> </Td> <Td> Three Cent 14 mm 0.8 g 0.750 fine 1851--1853 14 mm 0.75 g 0.900 fine 1854--1873 </Td> <Td_colspan="2"> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> </Td> <Td> </Td> <Td> Half Dime 15.5 mm 1.24 g 1794--1873 </Td> <Td> Dollar 15 mm 1.67 gr 1849--1889 </Td> <Td> $5 AGE Bullion 16.5 mm 3.11 g 1986--present </Td> <Td> $10 APE Bullion 16.5 mm 3.11 g 1997--present </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> Three Cent 17.9 mm 1.94 g 1865 - 1889 </Td> <Td> Dime (Clad) 17.91 mm 2.268 g 1965--present </Td> <Td> </Td> <Td> Dime 17.9 mm 2.5 g 1796--1964 </Td> <Td_colspan="2"> $2.50 Gold Quarter Eagle 18 mm 4.2 g 1796--1929 </Td> <Td> </Td> </Tr> <Tr> <Td> Small Cent 19.05 mm 2.5 g 1943 </Td> <Td> Small Cent 19.05 mm 3.11 g 1864 - 1982 </Td> <Td_colspan="2"> Small Cent 19.05 mm 4.67 g 1856 - 1864 2.5 g 1982--present </Td> <Td> </Td> <Td> </Td> <Td_colspan="2"> Three Dollar 20.5 mm 5.01 g 1853--1876 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> Nickel 21.21 mm 5 g 1866--present </Td> <Td> Nickel 21.21 mm 5 g 1942--1945 </Td> <Td> Twenty Cent 22 mm 5 g 1875--1878 </Td> <Td> $5 Half Eagle 21.6 mm 8.36 g 1795--1929 </Td> <Td> $10 AGE Bullion 22 mm 7.78 g 1986--present </Td> <Td> $25 APE Bullion 22 mm 7.78 g 1997--present </Td> </Tr> <Tr> <Td> </Td> <Td> Half Cent 23.5 mm 6.74 g 1795--1857 </Td> <Td> Two Cent 23 mm 6.22 g 1864 - 1873 </Td> <Td> Quarter (Clad) 24.26 mm 5.67 g 1965--present </Td> <Td> Quarter (40% Ag) 24.3 mm 5.75 g 1976 (S) </Td> <Td> Quarter 24.3 mm 6.25 g 1796--1964 </Td> <Td_colspan="2"> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> Dollar 26.5 mm 8.1 g 1979--Present </Td> <Td> </Td> <Td> </Td> <Td> $10 Eagle 27 mm 17.5 g 1795--1933 </Td> <Td> $25 AGE Bullion 27 mm 17.5 g 1986--present </Td> <Td> $50 APE Bullion 27 mm 15.6 g 1997--present </Td> </Tr> <Tr> <Td> </Td> <Td> Large Cent 29 mm 10.89 g 1793--1857 </Td> <Td_colspan="2"> Half Dollar (Clad) 30.61 mm 11.34 g 1971--present </Td> <Td> Half Dollar (40% Ag) 30.6 mm 11.5 g 1965--1970, 1976 (S) </Td> <Td> Half Dollar 30.6 mm 12.5 g 1796--1964 </Td> <Td_colspan="2"> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> </Td> <Td> </Td> <Td> </Td> <Td_colspan="2"> $50 Bullion 32.7 mm 31.1 g 1986--present </Td> <Td> $100 APE Bullion 32.7 mm 31.1 g 1997--present </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> </Td> <Td> </Td> <Td> </Td> <Td_colspan="2"> $20 Double Eagle 34 mm 35 g 1849--1933 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> Dollar (Clad) 38.1 mm 22.68 g 1971--1978 </Td> <Td> Dollar (40% Ag) 38.1 mm 24.59 g 1971 (S) - 1976 (S) </Td> <Td> Dollar 38.1 mm 26.73 g 1794--1964 </Td> <Td_colspan="2"> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td_colspan="2"> </Td> <Td> </Td> <Td> $1 ASE Bullion 40.6 mm 31.1 g 1986--present </Td> <Td_colspan="2"> </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Steel Alloy </Th> <Th> Copper </Th> <Th_colspan="2"> Copper Alloy </Th> <Th> Silver Alloy </Th> <Th> Silver </Th> <Th_colspan="2"> Gold </Th> <Th> Platinum </Th> </Tr>

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