Chronology of the Indo-Bactrian rulers is based largely on numismatic evidence. Bactrian coins were imitations of Greek issues, but they gradually acquired a style of their own. Legend of Indo-Bactrian coins were inscribed in Greek, Brahmi, and Kharosti scripts.

Silver tetradracham of Hippostatos  c. 65-55 BCE.
Obverse: Diademed and draped bust and legend BASILEWS MEGALOU SWTHROS IPPOSTRATOU  in greek.
Reverse: Helmeted horseman on a prancing horse with a monogram and legend in Kharosti script.
Weight: ~  9.50 grams.
Reference:  Bopearachchi Série 5,  Mitchiner 443c
 

,