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Message:: [QUOTE="Insider, post: 3010735, member: 24314"]In my limited experience, in the 1970's when using a stereomicroscope, it usually took less than 4 seconds to detect 99% of the counterfeit or altered coins.  Over the decades, that time has creeped up.  Detection of all but the most dangerous counterfeits is still done very quickly. That said, in some coin series (Example: Trade Dollars) what formerly took about 6  seconds before the deceptive counterfeits in the 1990's (?) were discovered has now risen to over a minute on many coins! Graders at NGC or PCGS do not have the need or luxury of studying a coin for hours!   As to keeping TPGS "mistakes" in the slabs for education <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /> and display <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie85" alt=":smuggrin:" unselectable="on" unselectable="on" /> ...I can guarantee that it has caused bad blood <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie4" alt=":mad:" unselectable="on" unselectable="on" /> - mostly to the detriment of "outside" specialists. [/QUOTE]