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JimBOne other point I don't think anybody has mentioned yet: when looking at the edges, if one side is significantly brighter than the other three (or two) and some of the other indicators mentioned above are also present, it is probably trimmed. If you take a T206 for example, those edges have been exposed to various elements for nearly 100 years. If a side has been trimmed in the last 20 years, it will be much brighter due to less exposure.
JimB