Gold filling is a mechanical, not chemical, process and cases like the one here contain a high percentage of heavy solid gold. Gold plating, a process involving electric current and the submerging of the item to be plated in a chemical bath, leaves only the thinnest coating of gold, a few microns thick, on a case and is to be regarded as vastly inferior. Gold fill is not gold plate and the two should not be confused. The resulting stack was rolled out under immense pressure to create cases that had the appearance of gold on both their inner and outer surfaces, but a core of, in this instance, steel. This case is 10 karat gold filled, which means that it was constructed by taking two thick sheets of gold and sandwiching between them a sheet of base metal. It is not new-old-stock and there are a few tiny imperfections to the case here and there, but it is obvious from even casual inspection that this is a piece that has been a cherished possession of its former owners and has led a very easy life.
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