It is difficult to give even comparative values for money from before the 20th century. Classical historians regularly say that in the 5th century B.C.E. the daily wage for a laborer was one drachma. The Greek historian Polybius, writing about the Roman armies during the Carthaginian wars, says that the daily wage of a cavalryman was 1 drachma, while an infantryman received 2 obols (one third as much) -- this is besides their daily grain ration.
The 5th century Athenian 4 drachma piece had a profile bust of Athena on the front and her owl on the obverse.
see Denarius