Obv: Bust of Nahapana Right Rev: Thunderbolt and Arrow, legend in Brahmi (left) and Kharosthi (right), "Nahapana, King and Satrap" Nahapana was the third or fourth--and final--king of the first wave of Indo-Scythians to push into the heartland of India. He created a booming economy (as evidenced by a huge outpour of silver coinage) but his legacy came to a screeching halt when he was defeated and killed by the native Satavahana empire. His entire family was executed and it would be another several decades before the Scythians were able to re-take the lost territory.
Yes—this type is listed as AR=argentum: silver. I’m not even close to being an expert — I had to Google it. I don’t know what the ratio of silver to other metals is listed as.