When grading coins there's three sides to grade, obverse, reverse and rim, and in that order. Most collectors, graders and dealers consider the obverse first but the reverse has something to say for the grade as well. The rim, not so much, but gouges or heavy marks on the rim can cause a coin to loose a point in grade.
So if a coin's obverse appears G6, but obtained a G4 grade, it might be that the reverse's wear is closer to AG3 and off-sets the obverse grade a point. Since grading services don't give G5 grade then the coin was graded G4. If it was resubmitted it might obtain G6 next time, and not all grading services will grade exactly the same.
So consider these facts when looking over these images. These photograde images are just for comparison's sake and not to be used as a definitive guide to any one coin's grade. However, ALL of the coins were professionally graded by PCGS and NGC.