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Impurities in the blank, and the toning normally follows the impurity flow
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You could start by looking for these Pendant King Thailand Rama 5 Yant Thai Amulet Talisman Fortune Protect life
According to this article, the counterfeits should weigh 5.4g as opposed to a normal 5.0g http://www.error-ref.com/henning-counterfeit-nickel/
Test it with a magnet to make sure. Canadian quarters in 1968 were made in both .500 silver and also in nickel
Looks to be past that point now. A rinse in acetone put in a flip or folder. Write down it's attributes and enjoy it
Looks like a Spanish 8 Reales, but whether it is genuine I am not qualified to give an opinion
Looks like Stage A
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The scratch appears to be there so more likely to be stage A. Can you get shots of the die scratches upper left and right of Monticello
Your images got a bit out of order there. First two are what you are listing as 6/7 i think. That is damaged surfaces and the zinc showing through...
Not yet. @physics-fan3.14 has more important issues to deal with at the moment. He explained in an earlier post
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It is fine. When I remove them from the flips they can have a bath in distilled water, then I take more fotos
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