Should be graded 1-100. Look at centering, corners, creases, focus, notches , print marks, color or eye appeal etc. For example :if a crease on the card the highest # would be 40 and go from there. If good 55-45 centering with crease gets around 40, if centering is less continue to go down maybe 35, etc.
Cards with borders should be computer analyzed with laser to determine precise centering ( no qualifiers ) ! If 80/20 then maybe 65 would be the maximum grade with other factors lowering this number ( such as a crease etc).
If a grading company would do this ( 1-100 scale with computerized guidelines and remove the human element) I would send in my cards. I would think the card could be placed under a measuring device and a computer readout could get a precise reading.
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