Australian shilling, 1969 Fijian twenty cents (same size and shape as Australian and New Zealand twenty cent pieces, easily missed in currency exchanges), and 1966 Australian fifty cents.
The fifty cent piece is from the year that decimalisation of Australia’s currency occurred, but they were replaced in 1969 by the current, heavier dodecagon design. Why? The round coins were made of 80% silver and 20% copper, and eventually their material price was more than their face value.