The Distater denomination
The Distater - double stater - was an ancient Greek denomination with the value of two staters.

In silver it typically weighs around 16 grammes. It was also struck in gold.
Distater

(1) Thourioi c. 400-300 BC
AR Double Nomos | Distater Thourioi
Obverse: head of Athena right wearing crested Attic helmet decorated with Skylla
Reverse: bull butting right; 2 fish right in exergue ΘOYPIΩN / EYΦA
Ref: SNG COP. 1430