I've had this coin for a few months now but just now getting time to post it. I have enjoyed expanding my ancients into Parthians this year. I often overlook them for the most part since to my untrained eyes, they do look similar at quick glances I don't intend to make them my main focus, I still enjoy Romans too much, but I will continue to add them when I can. I picked this coin up at Civitas, he was a ruler I needed & it was priced right. Artabanos II (10 - 38 A.D) AR Drachm O: Bare-headed, left, w/4-strand diadem, 2 loops and 3 ribbons; medium-long, almost straight hair, mustache, long square-cut beard; earring, 3-turn necklace; tunic/cuirass. R: Archer, right, on throne, w/bow in vise-like outstretched hand; below bow monogram; 7-line legend: BΛCIΛEΩC BΛCIΛEΩN ΛPCΛNOΔ EVEPΓETO(V) ΔIXAIOV (E)ΠIΦΛNOYC ΦIΛEΛΛXOC. 3g 19mm Ekbatana Mint Sellwood 63.6, Shore 341, Sunrise 412 (Artabanos IV)
You are not alone - this one in particular a challenge - here's a page on differentiating various look-alikes (Sellwood 63, 65, 66, 74). And another 63.6: Parthian, Artabanus IV, c. AD 10-38, AR drachm, Ecbatana mint Obv: Bust left, long square cut beard, hair almost straight, earring visible Rev: BAΣIΛEΩΣ BAΣIΛEΩN AΡ-ΣANOΥ EΥEΡΓETOΥ ΔIXAIOΥ EΠIΦANOΥΣ ΦIΛEΛΛHXOΣ, Archer (Arsakes I) enthroned right, holding bow; Ecbatana monogram below bow Ref: Sellwood 63.6 (Artabanus II)