"We had to pay tuppence ha'penny per week for our milk but it always seemed to be ice cold." Shirley Hitchcock wrote in her essay recalled her life in infant school in 1920s.
Ha'penny means half penny, and tuppence is a variant of two pence.
I have never seen a half penny coin.
Nowadays, I see people throwing away one pence or two pence coin. When I send/pick up my daughter to/from school or take her for a walk, sometimes we may be lucky enough to find a coin on the road, and my daughter always feels very excited. Because she could save in her money bank and buy a roller skate for her next birthday.
Her mum bought her roller skate for her 4th birthday, although she hasn't save enough money for it.