he fineness of gold or gold alloy in any item, the part of the gold or gold alloy used may not contain or have attached to it any solder or alloy of inferior fineness used to braze or unite the parts of the item.(c) With respect to any item other than flatware or a watch case, in addition to the requirements of subsections (a) and (b) of this section, the actual fineness of all gold, gold alloy, a