Part of the problem with grading is that some cards are undergraded and some are overgraded. Not all grading is accurate.
If someone with better skills than me could post images of the two 1951 Bowman Mantles just sold in Heritage, it would be useful.
The one graded by PSA was poorly centered and out of register. Given those two crucial flaws, it never should have been graded higher than VG 3.
And the SGC example was as nice a VG-Ex as you could possibly hope for, with near perfect centering, very strong corners, and deep rich colors. It had two tiny gum stains on the reverse. At minimum, it was a very strong VG-Ex and should have easily qualified for the 4.5 grade.
So the latter was easily a grade and a half better than the former, which the market perfectly recognized. Had each been accurately graded, the cards wouldn't even be worth discussing.
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