Lower grades are tough sometimes. Different id'ing points may not show up. I love looking thru a group of ms range coins. Even common dates. I don't bring a vam book just my redbook. But I always bring my loupe an look for common signs of vams. (Doubles, shifted mint marks, clashes, gouges, etc.) If there are two of the same year but one has an oddity. I'll get the odd one. Really vams are pretty common since there were several dies used each year and mint. One shop I go to has a pretty wide range of coins and if I really look I'll find at least one.