That depends on the country, denomination, and condition.
Most likely, somebody has silver plated your coin, making it a novelty item with no collector value. However, it is possible you have a coin struck on the wrong planchet, worth about $50
US circulation coins prior to 1965 were made of coin silver, not sterling silver. Coin silver has more copper in it for hardness, so that the coins wouldn't wear out as fast.
The value of a silver coin is always changing because the value of silver is always changing. See the related link below for a silver coin value calculator. This does not give the actual value of the coin but it does give the value of the metal used to make the coin. This is know as the melt value.
Franklin half dollars are not rare or even scarce so if the coin has any wear at all, the value is just for the silver about $12.00. 1953 is a common date.
Metal value depends on the purity of the silver and the weight of the coin. Numismatic value depends on the condition of the coin.
A Silver Eagle Bullion coin is 99.9% pure silver and weighs 1 oz per coin. The stamped value of the coin is U.S$1 however the intrinsic value of the coin is the value of the silver within that coin. If the the spot price of silver was $30oz at the time of checking, then the value of that coin would be worth at least $30 or more.
The value of an uncirculated 1999 Silver American Eagle Littleton coin fluctuates based on the market for silver. However, a coin can be expected to have a value of about $40.
This coin is most likely worth the silver value.
1848. Silver. Twenty. Dollar. Coin
The 5 coin proof set has a value of $6, the 10 coin set has a value of $15 and the 10 coin silver set has a value of $48.
The average value of a 1953 five dollar silver certificate, in mint condition, as of 2013 is $15.00.
It really depends on which coin it is. Is it a US silver dollar or dime? There is a big difference. Is it a world coin? What country is it from? All of these things matter when figuring the value of a coin.