The 'doctoring' of coins is an ever evolving trade. As a given technique becomes known, a better technique is developed.... meanwhile, the less knowledgeable continue to buy the older processed coins. Depending on the type of 'doctoring', it may not be detectable - i.e. some tarnish processes - which is why there is debate on some coins in slabs. Knowing your series is important. However, even the knowledgeable can be duped. Cheers, RickO
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The 'doctoring' of coins is an ever evolving trade. As a given technique becomes known, a better technique is developed.... meanwhile, the less knowledgeable continue to buy the older processed coins. Depending on the type of 'doctoring', it may not be detectable - i.e. some tarnish processes - which is why there is debate on some coins in slabs. Knowing your series is important. However, even the knowledgeable can be duped. Cheers, RickO