Gotta love that Australian English accent that was Proper English in the mid 60s.
This ad was on all television stations -- all 4 of them, and for some reason I remember their call signs: ABN2, ATV7, TCN9 and TEN10.
I was about 5 years old when we switched to decimal currency. I can remember going into the school shop with a "thrippence" coin (3d) and buying HUGE bags of mixed lollies. The three pence coin vanished from circulation quickly, to be replaced by 1c and 2c coins.
The 50c coin shown in the old ad was withdrawn very quickly. The Mint made them of almost pure silver, and when the price of silver spiked in 1967 the metal was worth more than the face value of the coins, so the Mint quickly took them out of circulation. A round 50c is now worth $50 to $100
That's a very young QEII
(Image from Wikipedia)