The British Halfcrown coin was first minted in 1549 and last minted in 1967, with a few years missing in between. In the unlikely event that you do have a complete collection of British Halfcrown coins and, depending on the condition of the coins of course, you would have something of great value, considering that the pre-1919 coins were made from .9250 silver. The only helpful suggestion I can make, is to take the lot to a reputable coin dealer for a serious valuation.
A British 1965 Churchill Crown uncirculated and in mint condition might get up to £2 GBP.
A British 1972 Silver Wedding Crown uncirculated and in mint condition might get up to £2 GBP.
A British 1977 Silver Jubilee Crown uncirculated and in mint condition might get up to £1.50 GBP.
A British 1980 Queen Mother 80th Birthday Crown uncirculated and in mint condition might get up to £2 GBP.
A British 1981 Royal Wedding Crown uncirculated and in mint condition might get up to £2 GBP.
There were 1,710,946 1892 British Halfcrown coins minted.
There were no British Halfcrown coins minted from 1865 to 1873 inclusive.
There were no British Halfcrown coins minted from 1752 to 1815 inclusive.
British 1913 Halfcrown coins were minted in 92.55% silver only
No. There were no Proof Halfcrown coins minted from 1840 to 1849 inclusive.
No. All British Halfcrown coins prior to 1919 were made of almost pure silver. In 1947, all British silver coins were from then on, made of cupro-nickel.
All British Halfcrown coins minted from 1949 to 1967 inclusive are made from copper nickel alloy.
All British Halfcrown coins, up to but not including 1920, were made from sterling silver (92.5% silver).
All British Halfcrown coins minted from 1947 to 1967 inclusive are made from copper nickel alloy.
All British Halfcrown coins from 1816 up to and including 1919 were made from sterling silver or .925 fineness.
Since the Recoinage Act of 1816, the British Halfcrown has varied from 14.1 to 14.2 grams. The British 1921 50% silver Halfcrown weighed 14.14 grams.
All British Halfcrown coins from 1816 to 1901 inclusive are made from sterling silver, are 32 mm in diameter and weigh 14.1 grams.