Looking through some coins on the PCGS population report and came across this one. It has a small cud on the reverse just to the left of the letter P in Penny. It seems to be a scarcer variety of the 1964 Halfpenny.
https://www.pcgs.com/cert/48467800
Nice one, can't say I've seen one of those before.
Nice.
Not a bad Perth halfpenny either.