![]() ![]() Because this material is not solid gold it cannot be hallmarked.Īaron Dennison was an important pioneer in watchmaking by machinery in fact it could be said that he was the most important pioneer, in that it was his ideas that started the mass production of watch movement parts by machinery in America, which had major knock-on effects on watchmaking in Switzerland and England. The layer of gold in gold filled or rolled gold plate items is much thicker than electroplated gold, and therefore longer wearing. Gold filled should be thicker and constitute at least 1/20th of the weight of the metal in the entire article, rolled gold plate must constitute at least 1/40th of the weight of the metal in the entire article. The thickness of the gold determines how long the item will last in normal use before the gold wears through and the base metal shows. Gold-filled or rolled gold plate is a composite material where sheets of gold are bonded by heat and pressure to a core of base metal such as nickel or brass. Dennison also made gold plated watch cases.
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