New Zealand being a member of the Commonwealth, has Queen Elizabeth II on the obverse of all coins since 1953.
The reverse of the New Zealand 10 cent coin has a carved Maori mask called a "koruru".
It is a 5 cent coin. NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand.
Such a coin does not exist. The Tuatara was featured on the reverse of the New Zealand 5 cent coin which was withdrawn from circulation and demonetised in 2006.
I am not sure what you mean by "delaminated". The New Zealand 5 cent coin was made from a copper-nickel alloy and was not plated with anything. NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand.
NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand. The New Zealand 1992 5 cent coin was only ever issued as part of a year set. A New Zealand 1992 cupro-nickel 5 cent coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to $10 NZD. There were 24,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
The 1 and 2 cent coins were demonetised on the 30th of April, 1990 and the 5 cent coin was also withdrawn and demonetised on the 1st of November, 2006. The 1, 2 and 5 cents coins are no longer considered legal tender.
A New Zealand 1998 5 cent coin, uncirculated and in absolute mint condition could fetch up to $2 NZD. There were 8 million minted. A reputable coin dealer will be able to give a more accurate valuation. NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand.
You do not specify a year. If by "Perfect" you mean "Mint condition" and "Uncirculated", a New Zealand 5 cent coin could fetch anything from $1 to $100 (NZD). A reputable coin dealer will be able to give a more accurate valuation. NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand.
The Australian 5 cent coin will go the way of the 1 and 2 cent coins one day, but the Royal Australian Mint has no plans to withdraw the 5 cent coin in the immediate future. New Zealand dispensed with their 5 cent coin in 2006.
The now demonetised New Zealand 5 cent coin featured the "Tuatara", the last surviving member of an otherwise extinct family of reptiles indigenous to New Zealand.
A New Zealand 1979 5 cent coin (only issued in a set), uncirculated and in absolute mint condition could fetch up to $8 NZD. There were 41,000 minted. A reputable coin dealer will be able to give a more accurate valuation. NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand.
A New Zealand 1968 5 cent coin (issued in a set only), uncirculated and in absolute mint condition could fetch up to $4 NZD. There were 75,000 minted. A reputable coin dealer will be able to give a more accurate valuation. NOTE - All New Zealand 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand.
The New Zealand 5 cent coin was withdrawn and demonetised on the 1st of November, 2006. All New Zealand pre-2006 5 cent coins are no longer legal tender, but they are redeemable for face value at the Reserve Bank of New Zealand. Unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth 5 cents.