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There is no documented evidence of a minting flaw in the "Festival of Britain" Crown, but it is possible. A reputable coin dealer will be able to advise.
It's impossible to say without knowing the coin's denomination and condition.
This is like asking "How long is a piece of string?". You have to state which coin and describe its condition.
The value of blue coins is x3 times of 1 yellow coin
Please check the coin again and post a new question. Great Britain has never used dollars, only pounds sterling.
Britain has never produced a 50 cent coin. The British 50 New Pence coin was first issued in 1969.
There was no "Battle of Britain" 50 Pence coin issued. Perhaps you refer to the 1994 "50th Anniversary of the Normandy Landing (D-Day)" 50 Pence coin. I have to point out that as I type this I have a "Battle of Britain 1940" fifty pence coin in my hand, so either I have a forged coin or Mr Lewis is incorrect in his assertion that no such coin exists.
A 1957 Great Britain half penny is not worth a whole lot. You can buy them on eBay for $2 or less.
Please post a new question with the coin's date and country of issue. If there's no country on it, a one penny coin is most likely from Great Britain.
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Britain is the only country still issuing Pennies. Presuming the coin is British and dated 1971 or later, the coins are still potentially in circulation and are worth 1 Penny in Britain. At todays values, that would be about 1.16 US cents.
All years of issue of the British 20 Pence coin are still in circulation and are worth 20 Pence in Britain and its dependencies. As at 14-May-2012, 20 Pence British is worth about $0.32 USD.