Your coin is almost certainly a privately-issued token, commemorative item, or fantasy piece. You'd need to have it examined in person by a knowledgeable dealer or collector to be sure.
It doesn't fit the description of any US nickel, for several reasons:
The face value of a nickel coin in the United States is five cents.
The melt value of something is the value of the metal itself. For example, a 1964 nickel has a melt value of 5 cents because 1.8 cents worth of nickel and 2.7 cents of copper.
A 1976 nickel is worth face value, which is five cents. It is not worth more due to its age or any other factors.
5 cents.
Its face value is 5 cents, but the melt value of a 1955-1981 Canadian nickel is $0.09 so the melt value is 4 cents more than the face value of the coin5 cents. It's not rare, and many are still in circulation.
5 cents.
5 cents.
5 cents.
5 cents
5 cents
A nickel is worth 5 cents so n nickels have a value of 5n cents.
A nickel is worth 5 cents so if you have N nickels their value in cents is 5*N