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The 1986 Canadian 5 cent coin is made of 75% copper and 25% nickel. This mixture gives the coin a silver color not a copper one. I would say that your coin has environmental damage of some type. US nickels have the same composition. Nickel that have been in water for a time tend to turn brown, also some chemicals will do that. The only other thing is, it could be a nickel on a cent planchet but that means the nickel is smaller. I find no listings of experimental nickels of that date. It could also have been a copper plating science project. Best I can do here.