Your question is a bit confusing because a half-penny and a crown are two very different coins. In the old coinage system England used before 1968, a pound sterling contained 240 pence, so a half-penny was worth 1/480 of a pound. On the other hand, a crown was worth a quarter of a pound, or 60 pence - 120 times as much.
Assuming you have a half-penny because it was a far more common coin, it would retail for less than a dollar in average condition.
An Eireann (Irish) 1937 bronze Halfpenny (pig), uncirculated and in absolute mint condition could fetch up to £50 GBP. If it has been circulated but still in good condition, it might fetch anything from £2 to £12 GBP. An Eireann (Irish) 1937 bronze Halfpenny (pig)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £400 GBP. A reputable coin dealer will be able to give a more accurate valuation.
There were no Australian 1937 Halfpennies minted.
The King Without a Crown - 1937 was released on: USA: 9 October 1937
Pearls of the Crown was created in 1937.
Modified coins have no collector value. Any value would be associated with the ring.
Such a coin does not exist. Canada has not used the British sterling currency system since the mid-19th century, and has never issued a Halfpenny or half cent coin since Confederation. If the coin has no country name on it and has a sailing ship on the reverse, it would be a British Halfpenny. Alternatively, you may have a privately minted Halfpenny token.
Between $25 and $318. In the future please add a condition of the coin so I can value it more precisely for you.
An Australian 1937 sterling silver Crown (Five Shillings)(George VI), uncirculated and in absolute mint condition could fetch up to $220 AUD. If it has been circulated but still in good condition, it might fetch anything from $35 to $60 AUD. There were 1.008 million minted. An Australian 1937 sterling silver Crown (Five Shillings)(George VI)(Proof), uncirculated and in absolute mint condition could fetch up to $42,000 AUD. There were 100 minted. 1937 and 1938 were the only years the "Crown" coin was released for general circulation in Australia. They were not a popular coin due to their size and weight and were discontinued. A reputable coin dealer will be able to give a more accurate valuation. Extra Information - It is composed of 92.5% silver and 7.5% copper. A clumsy manufacturing process, at the Perth Mint, occasionally damaged the rim of the coin.
The Imperial State Crown was manufactured in 1937, it is a replica of Queen Victoria's titular crown. It was made by Gerrard and Co. (then, Crown Jewellers)
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A king and a ship is probably a British halfpenny, dated 1937 through 1952, featuring King George VI.
77 years old (1937).