O.k. guys here's the deal. I couldn't tell what the coins that were eagle side up were, or why they were rare. Maybe an "S" mint? I know the years of the 40 percent silver, and 90 percent silver, looking for coins dated pre 1971. I have done research. I just couldn't tell what the deal was with those coins and still don't know. All someone would have to do is say oh hey man those are silver but it's hard to tell in the picture, or maybe its not hard to tell, either way I have done general research, but am not an expert. All I know is I am looking for coins pre 71, and coins with the "S" mint mark, from what I looked at that was the main things to look for, other than really old ones with different dudes on the coin. If you knew me.....even a tiny little bit you would know I am one of the most driven, determined sob's you'll ever meet, and when I start something I go head first, if that means asking a question I am EXPECTED to know the answer to, so be it. The reason I got hot right away is to show I don't put up with being talked down to, is it that hard to just answer the question?