When I first started collecting a few years ago I just pulled out any old ones I could find, and yes, as the stupid 9 yr. old I was, I for some reason kept late 60's quarters, dimes, nickels, and cents. Recently when I went through my coins again, I found that I had pulled out 2 silver war nickels, not even knowing about any silver content. But anyway, back to what I meant to get to, I had known that S mintmarks were of some value, and ended up with 1 1970, which turned out being a small date! Of course I can't find any good coins now, but maybe that's just because I raised my standards.