As (Roman coin) as, the (2), (2), . After the as had been issued as a cast coin for about seventy years, and its weight had been reduced in several stages, a as was introduced (meaning that it weighed one-sixth of a pound). At about the same time a silver coin, the denarius, was also introduced. Earlier Roman silver coins had been struck on the Greek weight standards that facilitated their use in southern Italy and across the Adriatic, but all Roman coins were now on a Roman weight standard. The denarius, or 'tenner', was at first tariffed at ten asses, but in
Gold coin other alloys. Furthermore, many countries continue to make legal tender gold coins, but these are primarily meant for collectors and investment purposes and are not meant for circulation. Many factors determine the value of a gold coin, such as its rarity, age, condition and the number originally minted. Most gold coins minted since the late 19th century are worth slightly more than spot price, but many are worth significantly more. Gold coins coveted by collectors include the Aureus, Solidus and Spur Ryal. In July 2002, a very rare $20 1933 Double Eagle gold coin sold for a record $7,590,020 at