Is There A List Of Modern Counterfeits?

Malaysia 50 sen 2007 http://goccf.com/t/359641&SearchTerms=50,sen

I think we've also seen some counterfeit early 20th c. gold from German states out here, and there are a lot of counterfeit US silver dollars (1878 - 1930s) that have come up, though I'm not tuned in to the specific dates. Depending on how far back is considered "modern" we get back to 16th to 18th century thalers, where there are vast numbers of fakes being peddled by RUssian sellers on ebay.

(And sounds like you have a Polish cleaning lady?)

@Pertinax, if someone is maintaining a list I suspect that it would be a long one and growing by the day.

Based on my experience as an authenticator (about 40 years) I would say that you should presume that every coin could be a fake. A list of counterfeits would be out of date before it could be printed.

You need to be able to tell the difference in hand quickly and accurately. Magnetic coins that should be silver are easy - they are all bogus. But there are many others that even give the "experts" fits.

However, there are other considerations as well.

Counterfeits made with the correct alloy metal do exist.

Some Circulating Contemporary Counterfeits are worth more than genuine coins in the same grades.

Numismatic Forgeries made to deceive collectors (not for circulation) are of almost no value.