Canadian ¢50 coin?

I not long ago found dual Canadian ¢50 coins, a single of them is from 2002 whilst a alternative a single is comparison as well as comes from 1972. we never listened about Canadian ¢50 coins, so what have been they?

I have no thought of where they come, we only found them in my purse recently.
@Adam K: we AM in Canada…

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