They are not especially valuable. They are worth a little more than other Halfcrown coins from the same period because there were fewer of them minted.
There were only about 9 million 1959 Halfcrown coins minted in contrast to the usual 15 million to 30 odd million Halfcrowns minted per year during the late 1950's and early 1960's.
Not much unless they are in mint uncirculated condition or Proof coins.
The most valuable New Zealand Halfcrown coins are the 1935 and 1944 coins in unciruclated condition. Circulated coins in good condition from 1933 to 1946 will usually attract a higher proce than those from 1947 onwards.
If you are interested only in the silver value, not all Halfcrowns were made from pure silver and the post 1947 coins contained no silver at all. Whatever the going rate for silver is. If you are interested in the collector (numismatic) value of the coins, please provide year and condition of the coins.
All New Zealand Halfcrowns from 1933 to 1946 inclusive, had a silver content of 50%. From 1947 to 1965 inclusive they were made from copper-nickel.
The British ruled India (or at least important parts of it) from the 1750s till 1947. Acctually the British Raj was the British colonial rule in the Indian subcontinent between 1858 and 1947. So they ruled in that time : 1858-1947.
how much is a 1947 singer sewing machine worth
All British "silver" coins from 1947 onwards were made from a copper nickel alloy.
India left the British Empire in 1947 because became independent.
India was previously ruled by the British. British rule took place from 1858 to 1947. In 1947, India was given its independence.
Portugal was not a British colony.
1947
1947
British Indian Army ended in 1947.