I have seen similar rounds but have never bought one. Remember that those are not made by the US mint. Also, a troy pound is only 12 ounces, not 16. Still sounds like a good deal getting 6 ounces for $80 Canadian. I doubt it has any value other than its silver. At the store where I saw them, they were in the generic silver box and sold for about 1 buck over spot per ounce (this was a while ago before silver premiums went crazy).
Jim