A British coin worth half of a penny.
" Not one halfpenny," said Mr. Pickwick. – The World's Greatest Books, Vol III by Arthur Mee and J.A. Hammerton, Eds.
You said you ran away with ninepence- halfpenny. – A Hero of Romance by Richard Marsh
And Maisa, I may add, is in the halfpenny papers. – The Man Who Drove the Car by Max Pemberton