“If I was buying I would buy Canadian Silver Maples. One ounce of .9999 fine silver with a face value of $5.”
How much do you pay for that $5 coin?
The face value would only come into play if silver fell below $5CDN an ounce. If I had silver coins I would not contemplate selling them at face value or really for any price. I would use them as insurance, not as a medium of exchange. If I had to use them to exchange them, things would be really, really bad.