<Table> Six old pence <Tr> <Td_colspan="2"> United Kingdom </Td> </Tr> <Tr> <Th> Value </Th> <Td> 6 pence sterling </Td> </Tr> <Tr> <Th> Mass </Th> <Td> (1816--1970) 2.83 (2016--) 3.35 g </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> (1816--1970 2016--) 19.41 mm </Td> </Tr> <Tr> <Th> Edge </Th> <Td> Milled </Td> </Tr> <Tr> <Th> Composition </Th> <Td> (1551--1816) Silver (1816--1920) 92.5% Ag (1920--1946) 50% Ag (1947--1970 Cupronickel (2016--) 92.5% Ag </Td> </Tr> <Tr> <Th> Years of minting </Th> <Td> 1551--1970 2016 - Present (not as circulating coin) </Td> </Tr> <Tr> <Th_colspan="2"> Obverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> Profile of the monarch (Elizabeth II design shown) </Td> </Tr> <Tr> <Th> Designer </Th> <Td> Mary Gillick </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1953 </Td> </Tr> <Tr> <Th_colspan="2"> Reverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> Various (floral design shown) </Td> </Tr> <Tr> <Th> Designer </Th> <Td> Edgar Fuller and Cecil Thomas </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1947 </Td> </Tr> </Table> <Tr> <Td_colspan="2"> United Kingdom </Td> </Tr>

When did the sixpence go out of circulation