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Houston said his most interesting discovery was a 222-year-old copper penny from the first decade of money minted by the United States.
The coin, which is about the size of a modern half dollar, bears the image of Lady Liberty on one side and "One Cent" on the "tails" side.
Similar coins have sold for about $200 on eBay, but he is currently planning to keep it for his own collection.
The treasure hunter said he is not revealing the exact location of the church because he wants to return to search the same area next year.