Any coin with a "genuine" minting flaw would have some value, above the usual, as a collectible coin. Genuinely flawed coins are not necessarily known about or documented until somebody turns up with one, since they are an "accident" of the minting process, and have escaped detection during quality control at the mint therefore, a valuation cannot be anticipated. A reputable coin dealer should be able to identify and confirm the coin as genuine and make a valuation. Flaws and errors on coins should not be confused with mutilation or mangling of the coin. It should be noted that many people have the interest, skill and enthusiasm to fraudulently alter otherwise normal coins for the purpose of personal gain or notoriety. Also, many coins are commercially produced for magic or trick purposes and these include "double headers/tails" and "impossible" coins like a US silver Dollar on one side and a British copper Penny on the other.
It depends on what you call "misstruck" post new question with more details.
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The last British Shilling minted for general circulation was minted in 1966.
These coins are still in circulation. Unless they are in mint condition, they are worth One Pound.
There is a one pound coin and a two pound coin but not a three pound coin.
The British One Pound coin is round.
A 20 Pence coin is a British coin worth one fifth of a British Pound (GBP). A "nickel" is a US 5 cent coin. At current exchange rates (Jan 2011), the British 20 Pence coin is worth about 32 cents USD.
Such a coin does not exist. The British One Pound coin was first issued in 1983.
There was no 1811 British Sovereign or One Pound coin minted.
There was no 1977 British One Pound coin minted. The first general circulation One Pound coins was minted in 1983.
There was no British 1901 Two Pound or Double Sovereign coin produced.
There is no such thing - the British currency is the Pound, the Spanish currency was Pesetas until the Euro.