 In October and November 2007, two more dies were discovered in Rhode Island with exactly the same design (though cut in relief), even down to the same small flaws.They were made of silver-plated lead, which is sometimes used as an engraving test since it is a cheaper metal.In 1786, for the first two issues of "Columbian Magazine", Philadelphia engraver James Trenchard wrote articles on the obverse (in September 1786) and reverse (in October 1786) of the Great Seal, and each issue included a full-page engraving of his own original version of the discussed side of the seal.