<Table> Peace dollar <Tr> <Td_colspan="2"> United States </Td> </Tr> <Tr> <Th> Value </Th> <Td> 1.00 United States dollar </Td> </Tr> <Tr> <Th> Mass </Th> <Td> 26.73 g (412.5 gr) </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> 38.1 mm (1.5 in) </Td> </Tr> <Tr> <Th> Edge </Th> <Td> reeded </Td> </Tr> <Tr> <Th> Composition </Th> <Td> <Ul> <Li> 90.0% Silver </Li> <Li> 10.0% Copper </Li> </Ul> </Td> </Tr> <Tr> <Th> Silver </Th> <Td> 0.77344 troy oz </Td> </Tr> <Tr> <Th> Years of minting </Th> <Td> 1921--1928; 1934--1935 </Td> </Tr> <Tr> <Th> Mint marks </Th> <Td> D, S. Located above tip of eagle's wings on reverse . Philadelphia Mint specimens lack mint mark . </Td> </Tr> <Tr> <Th_colspan="2"> Obverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> Liberty </Td> </Tr> <Tr> <Th> Designer </Th> <Td> Anthony de Francisci </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1921 </Td> </Tr> <Tr> <Th_colspan="2"> Reverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> A perched bald eagle </Td> </Tr> <Tr> <Th> Designer </Th> <Td> Anthony de Francisci </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1921 </Td> </Tr> </Table> <Tr> <Td_colspan="2"> United States </Td> </Tr>

Where is the mint mark on a peace dollar