The Coinage of India began anywhere between early 1st millennium BCE to the 6th century BCE, and consisted mainly of copper and silver coins in its initial stage. The coins of this period were Karshapanas or Pana. A variety of earliest Indian coins, however, unlike those circulated in West Asia, were stamped bars of metal, suggesting that the innovation of stamped currency was added to a pre-existing form of token currency which had already been present in the Janapadas and Mahajanapada kingdoms of the Early historic India. The kingdoms that minted their own coins included Gandhara, Kuntala, Kuru, Magadha, Panchala, Shakya, Surasena, Surashtra and Vidarbha etc. The tradition of Indian coinage in the 2nd millennium evolved with Indo Islamic rule in India. and the British Raj in the 19th century. Origin of currency in Indian subcontinent Prehistoric and Bronze Age origins Cowry shells were first used in India as commodity money. The Indus Valley civilisation may have used metals of fixed weights such as silver for trade activities which is evident from the DK area of Mohenjo Daro from the late Harappan period (dated 1900–1800 BC or 1750 BC). D.D Kosambi proposed a connection between Mohenjodaro class IV silver pieces and class D pieces with the Punch marked coins based on their remarkable similarity and identity between D-class weights. The remarkable similarities between Punch marked coin symbols with those appearing in the Indus seals have also been highlighted. Chalcolithic unmarked gold disc discovered from Eran have been dated to 1000 BC and due to their lack of ornamental use, it has been proposed that it was utilized as an object of money A similar gold token piece from Pandu Rajar Dhibi has also been interpreted as a coin, it is hammered on the edges and bears parallel marks, although weighing 14 grams, a quarter of the piece is missing hence its full weight of 21 grams would conform to the ancient coinage weight standards of India and confirm the vedic literary references of circulation of gold tokens in that period. Similar interpretations have been made regarding the use of silver circular objects from the Gungeria hoard. Weight standard Since the Bronze Age, ratti (0.11 or 0.12 gram) or the weight of the Gunja seeds have been used as a base unit for the measurement of mass in the Indus Valley civilization, the smallest weight of Indus was equal to 8