One of the areas that draw a pretty good amount of people is silver dollars.
This area is really being turned onto its ear because of an influx of counterfeit coins coming in from China.
One tip to help with the weeding out the fake ones from the real coins is to use a magnet on the suspect coins. Silver is a non-magnetic material, and the magnet will not stick to the coin. The fakes more often than not will be made from a base metal, and the magnet will stick to the coin.