<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2007) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2007) (Learn how and when to remove this template message) </Td> </Tr> <Table> Three old pence <Tr> <Th> Value </Th> <Td> ​ ⁄ pound sterling </Td> </Tr> <Tr> <Th> Mass </Th> <Td> (Silver) 1.4 - 1.5 g (Nickel - brass) 6.8 g </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> (Silver) 16.20 mm (Nickel - brass) 21.0--21.8 mm </Td> </Tr> <Tr> <Th> Thickness </Th> <Td> (Nickel - brass) 2.5 mm </Td> </Tr> <Tr> <Th> Edge </Th> <Td> Plain </Td> </Tr> <Tr> <Th> Composition </Th> <Td> (1816--1919) 92.5% Ag (1920--1946) 50% Ag (1947--1970) Nickel - brass (79% Cu, 20% Zn, and 1% Ni) </Td> </Tr> <Tr> <Th> Years of minting </Th> <Td> 1547--1970 </Td> </Tr> <Tr> <Th_colspan="2"> Obverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> Profile of the monarch </Td> </Tr> <Tr> <Th_colspan="2"> Reverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> Various </Td> </Tr> </Table> <Tr> <Th> Value </Th> <Td> ​ ⁄ pound sterling </Td> </Tr>

When did the silver threepenny piece go out of circulation