From this paragraph filled, rolled, and overlay have the identical minimum standard of at least 1/20 10k., unless the variation in karat or fraction is included in the mark.
"(3) An industry product or part thereof on which there has been affixed on all significant surfaces by soldering, brazing, welding, or other mechanical means, a plating of gold alloy of not less than 10 karat fineness and of substantial thickness5 may be marked or described as "Gold Filled," "Gold Overlay," "Rolled Gold Plate"or an adequate abbreviation, when such plating constitutes at least 1/20th of the weight of the metal in the entire article and when the term is immediately preceded by a designation of the karat fineness of the plating which is of equal conspicuousness as the term used (for example, "14 Karat Gold Filled," "14 Kt. Gold Filled," "14 Kt. G.F.," "14 Kt. Gold Overlay," or "14K. R.G.P."). When conforming to all such requirements except the specified minimum of 1/20th of the weight of the metal in the entire article, the terms "Gold Overlay" and "Rolled Gold Plate" may be used when the karat fineness designation is immediately preceded by a fraction accurately disclosing the portion of the weight of the metal in the entire article accounted for by the plating, and when such fraction is of equal conspicuousness as the term used (for example, "1/40th 12 Kt. Rolled Gold Plate" or "1/40 12 Kt. R.G.P.")."
