Thanks for the advice re. the New Zealand / Bahama mule "Australian Coin".
I have not heard about that mule coin before. I think in terms of numismatics, "Mule" coins are amazing. They must pack a real "kick" when you find them in your change !
One very lucky day in the future I hope to find a 2000 $1 / 10 cent mule in my change, though I am not holding my breath for that !.
Enworb, your search of 1c and 2c copper coins from the bank bought back some memories. Years ago I used to visit my local Commonwealth Savings Bank and ask to inspect their "halfpennies", "pennies" and "three-pennies". A clerk would pass over an old heavy wooden tray with the coins in their compartments. I would inspect them, and he would leave me to make my selection. It was a pretty honest business in those days.
Of course I never did find a 1930 penny or a 1923 halfpenny. But I did get a couple of 1946 pennies. And a complete collection of three-pennies too !.