Watch List notes:

COINS OF THE GREEK WORLD

PARTHIAN EMPIRE. Mithradates II, 121-91. Tetradrachm 120/117, Seleucia. Obv. Bearded, cuirassed bust with diadem to l. Rev. ΒΑΣΙΛΕΩΣ - ΜΕΓΑΛΟΥ - ΑΡΣ - ΑΚΟΥ - ΕΠΙΦΑΝΟΥΣ Arsake in Persian attire seated on omphalos to r. holding bow in r. hand. 16.15 g. BMC 3. Boston 2216. Sellwood 24.4. Broad flan. Extremely fine.

Ex Auction Hess/Leu 31. Lucerne, 6. December 1966, Lot 556.
For more information about the reign of Mithradates II. see: Assar, Gholamreza F., A Revised Parthian Chronology of the Period 165-91 BC, in: Electrum 11 (2006), S. 134 ff.; and also Olbrycht: Marek Jan, The early Reign of Mithradates II the Great in Parthia, in: Anabasis 1 (2010), S. 153.