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Britannia is an allegorical figure for (or personification of) Britain, often shown seated with a lion at her feet, as on the 50 pence coin. She was first invented by the Romans 2,000 years ago and is seen as the goddess of war, and passion. Britannia has been on the back of our fifty pence coins since 1672 but won't be for long thanks to a new government campaign for a new design. So, if you don't want to break the tradition, please sign my petition, in association with THE GUARDIAN to save our Britannia! Go to www.savebritannia.org/woorthington.petition to be a part of the online petition.
100,000
The value of a 1712 coin would vary widely. It would depend on its denomination, country of origin, and condition. It could be worth thousands of dollars if collectible enough.
Silver value March 9th, 2012 is approximately C$33. Sell value as a coin is approximately C$47.
As much as the sentimental value of which you pair to it.
£2.00
£2.00
£2. They're very common
More information is needed. Please post a new, separate question with the coin's denomination.
The same as every other 2-headed or 2-tailed "magician's coin" - a couple of bucks as a novelty item but no collector value because it's a privately-made trick coin.
You need to give us a bit more information, particularly what is the main motif on the coin (Britannia, a shield, etc.) and an estimate of what the coin is made out of (gold, silver, copper, etc.) and then we can better identify what it is and hopefully get you a value.
Please check your coin. Queen Anne was on the throne on in 1709, George I did not come to the throne until 1714.
Britannia can be found on the reverse of a Britishnon-commemorative 50 pence piece. Britannia also appeared on predecimal Pennies and pre-1936 Halfpennies.
No US silver dollars were minted for circulation from 1804 to 1835 inclusive. If your coin says ONE DOLLAR and is dated 1807 it's either a fantasy coin, a bullion "round" or one of the many fakes that have come from Asia during the last couple of decades.
£25
You have a British coin ("Georgius IV D.G. Britannia Rex F.D." is abbreviated latin for "George the Fourth, King of Britain and Defender of the Faith") dated 1821. To get a value, the denomination and condition of the coin would need to be known.
Please check your coin again and post a new question. Indian head cents were minted from 1859 to mid-1909.