Unlike the dimes and quarters, Canadian nickels didn't have a change in metal composition in 1968. The ones before and after '68 were solid nickel (until 1982, and with exceptions during WWII and Korea).
The last year for the Canadian silver 5-cent piece was 1921, except those coins weren't called nickels because they didn't contain any nickel. The Canadian nickel (actually made of nickel) was then introduced in 1922.
Any metal coin has value as scrap. In most cases the scrap-metal value is less than the coin's face value so that people can't make a profit by melting them. However US nickels (but not Canadian ones) are an exception to that rule. As of 2015 the prices of the metals used (75% copper and 25% nickel) in each coin total about 7 cents as scrap. The government forbids melting nickels and cents for their metal value, though.
That's an extremely broad question because nickels have been minted since 1866 at 3 different mints. Please see the Related Links for value guides. Also remember that except for the famous "war nickels" of 1942-45, US nickels have never been made out of silver so they're the only nickels that have any extra melt value. All other nickels are made of a copper-nickel alloy so any extra value they might have would be purely as collectible items.
None have any silver value. US nickels made from 1866 to mid-1942 and from 1946 to the present are made of a copper-nickel alloy, not silver.
Buffalo nickels don't contain any silver.
Any US nickel minted since the 1960s is pretty much only worth face value. Even the 2004-2005 Lewis and Clark Bicentennial nickels were minted in such large numbers that any you find in change have no added value.
The melt value for a 1964 nickel is the same as any other date of nickels (except 1942-45), because unlike the dime and quarter, nickels weren't silver, and there was no change to it in 1965. As of 19 August 2013, U.S. nickels have a melt value of 4.6 cents.
Liberty nickels were minted from 1883 to 1912. All nickels minted since 1938 have been Jefferson nickels, and ALL coins carry the word Liberty. In any case huge numbers of 2005 nickels were saved because they have a special design for the Lewis and Clark Bicentennial, and any that you find in change are only worth face value.
Please take another look at your coin. Since 1938, US nickels have carried a portrait of Thomas Jefferson, which is why they're called Jefferson nickels. Washington is on the quarter.In any case, it's only worth 5¢. They still turn up in circulation from time to time.
25 Canadian Cents. It isn't made out of any precious metals and is only worth face value. It is worth around 24.7 US Cents.
Dateless buffalo nickels are worth about 10 cents each. They're popular for use in crafts and jewelry.
There are no nickels inside a one hundred dollar bill, nor is there any nickel material in the bill. A one hundred dollar bill has the same monetary value as 2000 nickels.