300 BCE which are also perhaps the earliest source of Hindu representational forms. Most coins from Surashtra are approximately 1 gram in weight. Rajgor believes they are therefore quarter karshapanas of 8 rattis, or 0.93 gm. Mashakas of 2 rattis and double mashakas of 4 rattis are also known.The coins appear to be uniface, in that there is a single die-struck symbol on one side. However, most of the coins appear to be overstruck over other Surashtra coins and thus there is often the remnant of a previous symbol on the reverse, as well as sometimes under the obverse symbol as well. Uninscribed Die struck coins (4th century BC) Uniscribed die struck coins appeared around 4th century BC in Taxila and Ujjain. These coins were mostly in copper and rarely in silver, the metal dies were cast carefully with the required designs. These coins had some symbols similar to Punch marked coins. Svarna coins Quarter svarna coins have been excavated from gandhara. Besides svarna being a term for gold coins (called Svarna Rupa), it was also a weight standard which replaced Purana or Dharana in ancient India. According to Arthashastra one svarna or karsha was equal to 80 rattis (based on 1 masha = 5 ratti standard) Classical period (300 BCE – 1100 CE) Mauryan Empire The Mauryan Empire coins were punch marked with the royal standard to ascertain their authenticity. The Arthashastra, written by Kautilya, mentions minting of coins but also indicates that the violation of the Imperial Maurya standards by private enterprises may have been an offence. Kautilya also seemed to advocate a theory of bimetallism for coinage, which involved the use of two metals, copper and silver, under one government. The Mauryan rule also saw a steady emergence of inscribed copper coins in India as evidenced by Tripuri coins in Ashokan brahmi script and various pre Satavahana coins dated 3rd-2nd century BC in Deccan. The Indo-Greeks The Indo-Greek kings introduced Greek types, and among them the portrait head, into the Indian coinage, and their example was followed for eight centuries. Every coin has some mark of authority in it, this is what known as "types". It appears on every Greek and Roman coin. Demetrios was the first Bactrian king to strike square copper coins of the Indian type, with a legend in Greek on the obverse, and in Kharoshthi on the reverse. Copper coins, square for the