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<p>[QUOTE=&quot;Tom B, post: 1928030, member: 11854&quot;]Much of the AT call is simply based upon experience.&nbsp; The graders at the TPGs have generally been around for years and have seen thousands upon thousands of coins.&nbsp; They have an excellent grasp of what color combinations, brightness and patterns to expect for coins of different metals and eras and also understand how coins were likely to be stored.&nbsp; Similarly, they are well schooled in various methods of AT and what the coin might look like after exposure to many treatments.&nbsp; Therefore, when a coin comes in this pool of experience is used, along with common sense and an eye test, to make a call as to AT or not.</p><p><br /></p><p>Some coins are sufficiently close to the line of AT that they are called AT one time and NT another.[/QUOTE]</p><p><br /></p>

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