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Posted By: Eric Brehm

I think it is all about the corners (and edges and surface, i.e. defects related to age and handling) -- for determining the whole grade as a starting point. (And all four corners have to be '7 corners' to get a 7.) Then there is some range allowed within each grade for centering and print defects, which if exceeded will result in a drop in grade or the assignment of a qualifier. I'm suggesting that the half grades are mainly for identifying the cards that qualified for each grade based on corner/edge/surface evaluation, that are particularly strong with respect to centering and print quality. It's not quite all that simple, since many cards have a weird mixture of condition attributes, but I think that's the gist of it.

That yellow Ruth looks like about a 6.