[Peter_Spaeth]

Originally Posted by scotgreb

Bill - though I've discussed this "theory" before, don't eliminate the possibility that the flip was simply mis-keyed when created. I don't believe that all of the inconsistency in grading is explained by different graders, their techniques, experience, mood, etc. I believe that much can be explained by poor processes and quality control. Just my opinion, of course. Scott

That may happen occasionally, but my guess is that it only explains a small percentage of cases of grade changes. I've witnessed many a card go through different grades on the way to a final resting place, some quite different from each other. Part of it is just subjectivity inherent in grading. And people miss tiny defects especially on quick reviews of inexpensive cards that might be picked up the next time, or vice versa.