The early coins were imitations of gold coins of King Philip II of Macedon.
 
 

Celtic silver Tetradrachm from Danube Region. circa 3rd Century BC.
Obverse: Laureate head of Zeus facing right.
Reverse: Rider on horseback

Celtic silver Tetradrachm from Danube Region. circa 2nd Century BC.
Obverse: Laureate head of Zeus facing right.
Reverse: Rider on horseback