The value of NZ coins varies widely, and you will find a book listing these at most coin and stamp dealers.
The last New Zealand Shilling was minted in 1965.
New Zealand has never produced a 50 Shilling coin/note.
There were no 1936 New Zealand Shillings minted.
New Zealand has never issued a 20 Shilling coin.
The Maori warrior on the reverse of the New Zealand Shilling does not represent a particular individual. All New Zealand coins have a uniquely New Zealand image, or something relevant to New Zealand history on the reverse. The reverse of the New Zealand One Shilling coin shows a crouching Maori warrior carrying a taiaha.
The last New Zealand Shilling containing any silver at all, was minted in 1946. From 1947 onwards, all New Zealand Shillings were made from a copper-nickel alloy. The last New Zealand Shilling was minted in 1965. The 10 cent coins that replaced them had ONE SHILLING marked on them in 1967, 1968 and 1969.
For a valuation on any New Zealand banknote, the denomination, design, Chief Cashier and/or Governor and Serial Number would need to be known.
Yes. All New Zealand "silver" coins minted from 1933 to 1946 inclusive had a 50% silver content. From 1947 onwards, they were all made from a copper-nickel alloy.
New Zealand introduced decimal currency in 1967 and have never produced a half cent coin.
A New Zealand 1965 Shilling (Proof), does not get a valuation in any catalogue. There were only 10 minted, so that puts into the category of extremely rare and therefore unattainable. A New Zealand 1965 Shilling (Proof like), uncirculated and in absolute mint condition could fetch up to $10 NZD. There were 25,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
There were twelve predecimal Pennies in a Shilling, as used by many of the British Commonwealth countries. The British Shilling converted to 5 New Pence at the changeover to decimal currency. The Australian and New Zealand Shilling converted to 10 cents at the changeover to decimal currency.
A 1931 Bank of New Zealand Ten Shilling note (serial C), in very good condition, might fetch anything up to $475 NZD.A reputable coin dealer will be able to give a more accurate valuation.