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Apparently there is some surviving Chera coinage that features an elephant:
Details from The Hindu on what is probably the same coin:
The coin, which is almost a square in shape, has an elephant facing to the right and some symbols towards the top of the coin.... A drawn bow and arrow was visible on the other side. Below the arrow is an elephant goad (a prod used to control elephants). These coins bear a striking resemblance to the ones excavated from Karur in Tamil Nadu, said the archaeologists. ...it was for the first time that the coins of the Adi Chera period was excavated from Kerala.