The ancient drachma was used a form of currency as early as 1100 BC. It was the standard unit of silver coinage at most ancient Greek and Roman mints.
The Drachma was minted on different weight standards at different Greek mints. The standard that came to be the most commonly used was the Athenian or Attic one, which weighed just over 4.3 grams.
Value of the Ancient Drachma
While it is difficult to make comparisons between the ancient value of the drachma and the modern day equivalent a drachma in the 5th century BCE was roughly 43 USD in 2010.
According to classical historians in ancient Greece around the fifth and fourth centuries the daily wage for a skilled worker was one drachma, and for a juror half a drachma since 425 BC.
In modern times one drachma would be the rough equivalent of a skilled workers daily pay in the place where they live.