11. In the case of products the selling price of which varies from day to day according to the price of the precious metals contained in them the obligation to indicate the selling price referred to in Article 5(1) may be complied with by indicating in a manner which is unambiguous, easily identifiable and clearly legible –
(a)the weight, type and standard of fineness of each precious metal contained in the product; and
(b)any element of the selling price which is not referable to weight,
accompanied by a clearly legible and prominent notice stating the price per unit of weight for the type and standard of fineness of each precious metal contained in the product.