<Table> Halfpenny / Leathphingin <Tr> <Td_colspan="2"> Ireland </Td> </Tr> <Tr> <Th> Value </Th> <Td> ​ ⁄ penny </Td> </Tr> <Tr> <Th> Mass </Th> <Td> 1.78 g </Td> </Tr> <Tr> <Th> Diameter </Th> <Td> 17.14 mm </Td> </Tr> <Tr> <Th> Thickness </Th> <Td> approx. 1 mm </Td> </Tr> <Tr> <Th> Edge </Th> <Td> Plain </Td> </Tr> <Tr> <Th> Composition </Th> <Td> Bronze </Td> </Tr> <Tr> <Th> Years of minting </Th> <Td> 1971--1987 </Td> </Tr> <Tr> <Th> Catalog number </Th> <Td>--</Td> </Tr> <Tr> <Th_colspan="2"> Obverse </Th> </Tr> <Tr> <Th> Design </Th> <Td> Irish harp </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1971 (first use 1928) </Td> </Tr> <Tr> <Th_colspan="2"> Reverse </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Design </Th> <Td> Ornamental bird </Td> </Tr> <Tr> <Th> Designer </Th> <Td> Gabriel Hayes </Td> </Tr> <Tr> <Th> Design date </Th> <Td> 1971 </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Ireland </Td> </Tr>

When did the halfpenny go out of circulation in ireland