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Message:: [QUOTE="GDJMSP, post: 13922917, member: 112"]What the heck ? It's fairly simple, and to be expected in most cases - because the two companies do not use the same grading standards. Each and every TPG there is uses their own, unique set of grading standards - and they are all different from one another. To compound the problem, with one given coin series, PCGS uses standards that are tougher than those used by NGC on that specific series. While with another given coin series, NGC uses standards that are tougher than those used by PCGS on that specific series. And of course the same is true of the other TPGs as well. When it comes to the number of graders used by each TPG, yes some use 2 graders and a finalizer, some use 3 graders and a finalizer. But I have never heard of a single one that uses more than 3 graders and a finalizer. And they all use a blind grading system, which is defined as the grader not knowing who the owner/submitter of the coin is. Given all of this it's pretty hard to ever expect that any given coin will be graded the same by 2 or more different TPGs. What's more, it's fairly common for the exact same coin to be graded differently by the same exact TPG that graded it the first time. So when the exact same coin can be graded differently by the exact same TPG, how can one ever expect 2 different TPGs to grade the coin the same ? That said, it is also fairly common for a coin in an NGC slab to be sent to PCGS with the result being that coin is given an upgrade by PCGS. Or, for a coin in PCGS slab to be sent to NGC and be given an upgrade. And of course each has been known to downgrade the others coins. And every now and then - they cross. All of this has been going on for as long as all the TPGs have existed.[/QUOTE]

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