Articles made out of precious metals are usually assayed before they are put up for sale. This is done in order to determine the amount of pure metal in the article. Silver articles may be made out of an alloy of Silver and some other metal to give it strength. Different marks may be used for indicating the fineness of the metal, maker of the article, country and year of assay. The Silver from different countries may be distinguished by its fineness. A Silver standard is followed in many countries for determining the fineness of Silver in an article. The decimal system where a decimal number indicates the quantity of Silver in parts per thousandth is commonly used.
Spanish Silver has a Silver standard of .750 to .916. In terms of antique, Spanish Silver coins are very popular. Spanish real was the currency in Spain. The eight real piece became a standard among other currencies. Spanish coins were mostly irregular in shape but accurate in weight.