Quote:1. What's the best place to buy them? Is
ebay OK?
ebay is a terrible place to buy "uncleaned" coins. "Uncleaned" does not mean "unsearched". People who make a living out of this are usually pretty good at figuring out which coins are likely to clean up well, and which are not. They take the "good ones" and clean them themselves, dumping the rest back onto
ebay. By the time you get to them, they've probably already been through and picked over by half a dozen people. A randomly selected lot on
ebay is likely to be a bagful of slugs, that will never clean up no matter how skilful you are.
There are a lot of shysters on
ebay. Beware of anyone who boasts of glowing "I FOUND GOLD!" testimonials. They did not "find gold", in the sense of there being a gold coin in their lot the seller was unaware of. These sellers are not stupid and know what an actual uncleaned gold coin looks like. What the buyer actually "found" was either a tiny 17th century Indian gold fanam the seller salted into their lot, or a brass coin that "looked like gold" when cleaned up.
It would be far better to buy from a reputable dealer, some of which have been mentioned above by others.
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2. Is it best to purchase coins that are completely encrusted?
Related to answer 1; some "uncleaned" are actually "cleaned enough to know roughly what they are". If a coin is completely encrusted, it's either because it's obvious what it is even through the crust, or because it's obviously a slug.
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3. Are coins that are already showing detail likely partially cleaned and picked through for more valuable coins?
Yes. See previous answers.
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4. Anybody ever find anything truly interesting and/or valuable?
Of course. Even the best cleaners and spotters can throw away a "slug" that not only actually cleans up rather nicely, but is rather rare and valuable. It's just not very likely.
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5. Do lots usually consist of a single metal or can they be mixed?
In ancient times, "the coinage" was not treated as a single monetary system with interchangeable parts, as a modern monetary system is. Copper, silver and gold coins had different purposes and were used by different people for doing different things at different times. Thus, the coin types were usually carried and stored separately and, when lost, were lost separately. Rarely do coin hoards turn up that are mixtures of copper, silver and gold coins. If you find sellers of uncleaned coins selling bags of mixtures of metals, you can be sure they came from numerous different hoards.
Personally, I don't clean uncleaned coins. I know I do not have the necessary patience to do the coins the justice they would deserve. Plus, I'm afraid my knowledge of chemistry, combined with my impatience, would tempt me to experiment with finding chemical "shortcuts" that would end up doing far more damage.
Also, I generally don't like gambling, and buying uncleaned coins is a kind of numismatic lottery. I'd much rather pay a little extra, for a properly cleaned coin for which I already know (or can easily find out) everything about it.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis