That reverse type was used for some years by Nicaea in Bythinia, as Bob has noted. The obverse portrait could belong to anyone. Here's one from my collection of Severus Alexander: Severus Alexander, AD 222-235 Roman Æ provincial; 4.57 g, 21.5 mm Bithynia, Nicaea Obv: Μ ΑVΡ CΕV ΑΛΕΞΑΝΔΡΟC ΑV, radiate and draped bust right, seen from behind Rev: ΝΙΚΑΙΕ-ΩΝ between three standards Refs: SNG von Aul 624; SNG Cop 520 var; SGI 3787 var (laureate bust).
CARACALLA AE23 OBVERSE: Radiate, draped, and cuirassed bust right, seen from behind REVERSE: NIKOMHDEΩN ΔIC NEΩKOPΩN, Tyche standing left, holding rudder and cornucopia Struck at BITHYNIA, Nicomedia, 198-217 AD 7.1g, 23mm RG 234; WADD RG S546,234(1-3)
