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Halfcrown coins do not have St George on them. Please have a closer look at your coin and post a new question. It is possible that you may have a crown and not a halfcrown. The crown's value would be anywhere from £15 (scrap value) to £350 in mint condition. Check the edge too to see which REGNAL YEAR (number of years the queen has been on the throne in Roman Numerals). It could be either LXIII or LXIV. The LXIII is rarer.
There was no 1805 British Halfcrown minted.
Assuming you refer to 20th century British general circulation Halfcrown coins, none are currently rated as rare. The 1927, 1937 and 1950 "Matt Proof FDC" coins are considered to be of the highest rarity. The 1952 coin is unique, there was only one made.
The last British Halfcrown was minted in 1970.
The last British Halfcrown was minted in 1970.
Halfcrown coins were never minted in Australia.
Australia has never issued a Halfcrown coin.
A "Tanner" is a British colloquial term for a Sixpence. A "Halfcrown" is Two Shillings and Sixpence. There are five Sixpences (Tanners) in a Halfcrown.
Such a coin does not exist. The last Eire (Irish) Halfcrown was issued in 1967. The Halfcrown was withdrawn and demonetised after the introduction of decimal currency in 1971.
No. There were no Proof Halfcrown coins minted from 1840 to 1849 inclusive.
Such a coin does not exist. Australia has never produced a Halfcrown coin.