pursued by amateur aficionados than by professional scholars. The focus of modern numismatics lies frequently in the research of production and use of money in historical contexts using mint or other records in order to determine the relative rarity of the coins they study. Varieties, mint-made errors, the results of progressive die wear, mintage figures and even the sociopolitical context of coin mintings are also matters of interest. Subfields Exonumia (UK English: Paranumismatica) is the study of coin-like objects such as token coins and medals, and other items used in place of legal currency or for commemoration. This includes elongated coins, encased coins, souvenir medallions, tags, badges, counterstamped coins, wooden nickels, credit cards, and other similar items. It is related to numismatics proper (concerned with coins which have been legal tender), and many coin collectors are also exonumists. Notaphily is the study of paper money or banknotes. It is believed that people have been collecting paper money for as long as it has been in use. However, people only started collecting paper money systematically in Germany in the 1920s, particularly the Serienscheine (Series notes) Notgeld. The turning point occurred in the 1970s, when notaphily was established as a separate area by collectors. At the same time, some developed countries such as the United States, Germany and France began publishing their respective national catalogues of paper money, which represented major points of reference literature. Scripophily is the study and collection of stocks and bonds. It is an area of collecting due to both the inherent beauty of some historical documents as well as the interesting historical context of each document. Some stock certificates are excellent examples of engraving. Occasionally, an old stock document will be found that still has value as a stock in a successor company. The example of one of Alexander the Great's coin The example of the silver tetradrachm found in Byblos (ca 330-300 bc.) is indicative of Macedonian influence. Alexander's coin (To nomisma Alexandrou) is of the type of the head of beardless Heracles, with an aquiline nose on the right, represented with a headdress of lion's head and, on the reverse side, an aetophore Zeus (holding an eagle) enthroned with a scepter in his left hand. The type of this tetradrachm has a very assertive Macedonian and Greek character. The choice of representations is symbolic : the reminder of his divine lineage and his heroic character.