See the genealogy chart . This state of affairs lasted until the Roman general Lucullus took Nisibis in 68 B.C., diverting the attention of the Armenians away from Parthia to their east. But for the most part, Sinatruces appears to have been involved with the Armenians his full reign. It is believed that Sinatruces was an Arsacid prince, for little other reason can be found for placing him on the throne at his advanced age. His coins are found in Susa, as well as elsewhere, and indication that he recovered most of Iran, including Babylonia, for the Parthians.
Recent research shows the type likely does belong to Sinatruces.
See the article on recent research by Dr. G. R. Assar.