Flip (and slab) doctoring is nothing new. It has been discussed on Net54 in detail several times in the past, in great detail. The results of the Mantle flip(s) are somewhat novice. A well made flip is very difficult to recognize without a very close examination or a side by side comparison with one that is real.
To the best of my knowledge, all grading companies are aware of this issue. PSA, Beckettt and GAI have "definitely known" about this, for at least a couple years. Some have taken proactive steps to make their flips/slabs more secure. Not only does PSA know but almost perfectly forged flips have been sent for their review...still nothing.
Kevin
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