Friend of mine has 200 of them, are they worth silver value or billions and billions?

A friend of mine asked me to grade and evaluate some coins for him. I went over and found he had some simple Canadian Silver Dollars, and on first look saw them as circulated, and in rather poor condition. Not even in the AU state, beyond that, when I went to the NGC Global price guide, I found some very low graded coins could be worth hundreds if not thousands. Does anyone know about these coins and their possible value? They were in the mid 1960,s like 1965 and 66.

I am going over there again with the grading book by Whitman, 6th addition. Any input would be great.

Capt. Brian

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