Coins of the New Zealand dollar
This article concerns the coins of the New Zealand dollar.
Prior to 10 July 1967, the New Zealand pound, using the £sd system, was the currency of New Zealand. Coins of the pound tend to follow the size, weight, and composition of their British counterparts. The main coins in usage were the halfpenny ( 1⁄2d), penny (1d), threepence (3d), sixpence (6d), shilling (1s), florin (2s), and halfcrown (2s 6d).
Decimalisation of the New Zealand currency occurred on 10 July 1967, when the New Zealand pound was replaced by the New Zealand dollar at a rate of one pound to two dollars (10 shillings to a dollar). On the same day, new decimal coins were introduced to replace the existing pound coins. The first coins of the New Zealand dollar were 1c, 2c, 5c, 10c, 20c, and 50c. The 1c, 2c, and 50c coins were new sizes, with the 1c and 2c minted in bronze, and 50c in cupronickel. The new 5c, 10c, and 20c were the same size, weight, and value as the former sixpence, shilling, and florin coins. Indeed, until 1970, the 10 cents coin bore the additional legend "One Shilling".
The obverse designs of all the coins featured Arnold Machin's portrait of Elizabeth II, with the legend ELIZABETH II NEW ZEALAND [date]. The initial designs for the reverse sides of the coins introduced in 1967 were rejected by the Royal Mint. Several more designs were produced, followed by a vigorous public debate. James Berry's designs were eventually accepted for most of the coins, although he was asked to rework his design for the 5c coin and Francis Shurrock's design for the 10c coin.
In 1986, the portrait of Elizabeth II on New Zealand coins was changed to Raphael Maklouf's new portrait of the Queen.
Towards the end of the 1980s, the 1c and 2c were becoming of little value, and it was decided to withdraw these coins from circulation. The last coins of these denominations were minted for circulation in 1987, with collector coins being made for 1988. The coins were slowly withdrawn from circulation, before finally being demonetised (no longer legal tender) on 1 May 1990.
After the withdrawal of these coins, cash transactions were normally rounded to the nearest 5 cents, a process known as Swedish rounding. Some larger retailers (notably one supermarket chain), in the interests of public relations, elected to round the total price down (so that $4.99 became $4.95 instead of $5.00). Alternatively, many retailers rounded all their prices to the nearest 5 cents to avoid the issue entirely—so a New Zealand shopper often encountered products for sale at prices like $4.95.
...
Wikipedia