Coin details: Greek silver obol (1/6 drachm) coin dated 350-300 BC from Selge, Pisidia. Selge was situated on the southern slope of Mount Taurus where the river Eurymedon (Köprücay) forces its way through the mountains. It was once the most powerful and populous city of Pisidia.
The first photo shows the side with the helmeted Athena. In ancient Greek religion, Athena was a goddess of war, handicraft, and practical reason. Essentially urban and civilized, Athena was probably a pre-Hellenic goddess later taken over by the Greeks. Yet the Greek economy, unlike that of the Minoans, was largely military, so that Athena, while retaining her earlier domestic functions, became a goddess of war. Athena is customarily portrayed wearing an aegis, body armor, and a helmet and carrying a shield and a lance. She was widely worshipped, and the Romans identified her with Minerva.
The second photo shows the side with the Gorgon. In Greek mythology, the Gorgon was a terrifying female creature. The name derives from the Greek word gorgós, which means "dreadful." While descriptions of Gorgons vary across Greek literature, the term commonly refers to any of three sisters who had hair of living, venomous snakes, and a horrifying visage that turned those who beheld it to stone. In ancient Greece, the Gorgoneion was originally a horror-creating apotropaic pendant showing the Gorgon 's head.
Sources: Encyclopedia Brittanica/Forum Ancient Coins
