No, the mint has two dies to stamp the coins. One die for heads ond for tails. They fit into different parts of the machine. If you have a two headed coin you have a novelty coin. While there are no known 2-headed U.S. coins, there are 4 certified examples of genuine 2-tailed U.S. coins. And there are about 25 known genuine 2-headed or 2-tailed coins from other countries. Details about this can be seen here : http://varietynickels.com/articles/twotailed.htm The U.S. Mint designs their dies with different slots in the heads-side dies than those in the tails-side dies to prevent this error from happening. So you can see the likelihood of you having a genuine 2-headed or 2-tailed coin is infinitely small -- even less than your chances of winning the lottery. Most coins with two heads were struck at a mint the regular way, but they were cut in half and the two heads were put together by a skilled craftsman.
There are no general circulation British decimal coins that could be considered rare. The British 50 Pence coin of which there were the fewest minted would be the 1985 coin. There were 682,103 minted. There is mention of a "Double Headed" 1969 50 New Pence coin, but there is no convincing documentary evidence to support its existence. Most of what people claim to be "Double Headed" coins are trick or novelty coins available from magic shops.
Most likely, your coin has been plated with either zinc, silver, or nickel. This novelty item has no added collector value. The coin may have been dipped in mercury, a common "fun" practice in the 60's and 70's. That would leave a coin with a similar color to other coins, but could be dangerous to handle due to mercury poisoning issues. If there is a coin show in your area, you can take it there for free first-hand examination by the dealers. You may be able to find a local show by clicking on the Related Link, "Coin Shows." This coin could be one that was struck on the wrong 'Planchet'. If it is, it could be worth up to $225.00.
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