Identify the metal used in making the punch marked coins in c. 6th-century BCE:

Silver and Copper

The correct answer is Option (4) → Silver and Copper

Punch-marked coins made of silver and copper (c. sixth century BCE onwards) were amongst the earliest to be minted and used. These have been recovered from excavations at a number of sites throughout the subcontinent. Numismatists have studied these and other coins to reconstruct possible commercial networks.