I have never ever seen this and my dad who is 57 has never seen this either so I hope someone knows what this is. Here is a picture: I have looked up other coins from that year and none silver. *Mistake In Title. Suppose To Be 1974*
Its likely (99.9999%) that this is a coin that has been altered. Either dipped in Mercury or plated with something.
Create your own unique thread with pictures. This is an old thread. And if you read the responses then you know the answer... Plated. Not a mint error
Possibly, but not probably, struck on blank punched out of nickel, which is what all of the other denominations were struck out of in 1974.
Looks plated to me, but the easiest way for you to be certain for yourself is to weigh the coin - like US cent that are plated, if it weighs the same as a normal Canadian Cent (3.24 grams), or is just slightly more (up to 3.4 grams) it's plated. No need to do a specific gravity test on the coin.
Didn't notice that, just that the last half dozen posts were recent. My comments still are valid for a 1981 Canadian Cent.