404 B.C. ancient Athens silver obol (1/6 drachm) coin - Athena and owl - Very rare and graded by NGC

Photos are of the coin before and after grading at NGC. 

Athens is one of the world's oldest cities, with its recorded history spanning over 3,400 years, and its earliest human presence beginning somewhere between the 11th and 7th millennia BC. According to Greek mythology the city was named after Athena, the ancient Greek goddess of wisdom, but modern scholars generally agree that the goddess took her name after the city. Classical Athens was one of the most powerful city-states in ancient Greece. It was a centre for democracy, the arts, education and philosophy, and was highly influential throughout the European continent, particularly in Ancient Rome. For this reason, it is often regarded as the cradle of Western civilization and the birthplace of democracy in its own right independently from the rest of Greece.

Source: Wikipedia