1986-1989 - Elizabeth II - 20 Cents (20C)
1967 to 1990
On 10 July 1967, New Zealand's former pre-decimal pound currency, pegged to the British pound, was changed to a decimal dollar at a rate of two dollars to a pound. Therefore, 20 cents was worth a tenth of a pound. The 20 cent coin replaced the florin coin which had been worth two shillings, or a tenth of a pound.
Like the florin, the new 20 cent coin was made of cupronickel, 28.58 mm in diameter, 11.31 grams in weight, and had 100% edge milling. The 20 cent coin retained the presence of a kiwi bird on the reverse of the florin, albeit in a different design.
The original obverses of 20 cent coins depicted Arnold Machin's portrait of Queen Elizabeth II. In 1986 the portrait was changed to the one by Raphael Maklouf, which had been introduced to the coins of the pound sterling in the previous year. Mintings of this coin from 1990 are rare.
REF
1986-1989 - Elizabeth II - 20 Cents