This is a privately manufactured novelty item known as a Magician's Coin, made by altering two normal coins and gluing the pieces together. These sell regularly on eBay for a couple of dollars. See the related Web Links for more info...
Look at the coin again. The US never made any 5 dollar silver coins of any date.
In uncirculated condition, it's worth about $2.00 If circulated, it has no added value. All circulation halves dated 1971 and later are made of copper-nickel; they don't contain any silver.
Look at the coin's edge. It's not silver, it's copper-nickel. All copper-nickel half dollars dated 1971 and later are only worth 50¢ if they're in circulated condition. Uncirculated, perhaps a dollar.
It's still worth five cents in Canada.
There's never been a wheat-back nickel. All 1988 Jefferson nickels have the familiar picture of his home, Monticello.Wheat-back cents were minted from 1909 to 1958.
Circulated U.S. $1 bills dated 1977 and later are only worth face value.
Any standard dime dated 1965 or later and taken from circulation is worth only 10 cents. However, if by "copper" you mean that one side of the dime is copper-colored and the other is silver-colored (nickel, actually), you may have what's called a lamination error. That happens when one side of the coin's cladding (the nickel-colored part) doesn't bond properly. This is considered to be a mint error and retails for 5 or 6 dollars.
nickel
@1988
The German 1 Mark coins from that era were actually made of copper-nickel, and the highest collector's value would be around $4, if it's still in uncirculated condition.
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