<Tr> <Th> Designer </Th> <Td> Frank Gasparro </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1964 to present, excepting 1975 and 1976 </Td> </Tr> <Tr> <Th> Design </Th> <Td> Independence Hall </Td> </Tr> <Tr> <Th> Designer </Th> <Td> Seth G. Huntington </Td> </Tr>

When did us stop putting silver in coins