http://agathe.gr/democracy/administration_and_bureaucracy.html
Administration and Bureaucracy The economy of Athens was supervised by numerous boards of officials in charge of the mint, the marketplace, weights and measures, and the grain and water supplies. Most ... Official measures come in clay and bronze and were used both for dry goods (nuts, grain) and for liquids (wine, oil). Dry measures normally had a cylindrical or mug-like form; liquid measures, much less abundant, were in the shapes of jugs, amphoras, or other vessels. ... The coin type was appropriate to Athens and easily recognizable: on one side the helmeted head of Athena, patroness of the city, on the other side her sacred symbols, the owl and olive sprig. These figures were used for centuries with only the slightest changes.