One of the coin that was so rare in India is 1839 Victoria coin.This was a plan coin that most attract to the collector,its authentication define its trade mark which was surface of the one side of the coin.One side define a image of Victoria & another side its define trade mark & value of the coin.Fake coin must make by cheater but never made a real good forgeries.Same rule is applied here its surface must smooth never rough. Its trade mark was little different from another you can easily differentiate. Collector buy it easily with a offer of more than 50,000 rupee.