Watch List notes:

Mithradates I (171-138), Tetrachalkos, Ekbatana, c. 171-138 BC; AE (g 7,69; mm 21; h 6); Bearded bust r., wearing diadem, earrings and spiral torque; behind, monogram, Rv. ΒΑΣΙΛΕΩΣ / ΑΡΣΑΚΟY, the Dioscuri galloping r. Sellwood 12.10.
Rare. Green patina, about extremely fine.