The history of Greek settlement in the north-western part of India before Alexander’s invasion is only known from coins. Even the history of Satavahanas, about whom the different version of the Puranas give different genealogical and chronological list of kings are known from coins alone.
The earliest coins available in Odisha are punch-marked coins which were in circulation between 4th century B.C. to 4th century A.D. These coins were profusely available in coastal eastern parts of Odisha.