Australia Day v Invasión Day, page-99

You are right, my uncle brought 2 of them back from the war, my grandmother still had them in a tin when I was a kid. I ask a coin/ note dealer 10 years ago if he had heard of them and he said they were quite common, the Japanese soldiers had been issued with them to use as the currency after the invasion, which luckily for us was stopped by the Americans in the battle of The Coral Sea. If the British didn't come here it would have been the Dutch, French not long after Phillip or Japanese in the 40s.