Extremely rare New Zealand 1975 20 cent coin mis-struck with border of Hong Kong $2 coin, one of about 15 of its kind. The New Zealand 20c piece had been minted in the shape of a Hong Kong $2 coin by mistake in 1975, making it one of the rarest New Zealand coins in existence. The coin was struck when the Royal mint was making 5 million 20c coins for New Zealand before it went on to strike 60 million Hong Kong's new $2 coins. Face of New Zealand 20c coin but shape of Hong Kong $2 coin. Together with a normal 1975 20c coin and a $2 Hong Kong coin