here's an unofficial issue that paired an Roma obverse with a Constantinopolis reverse
VRBS ROMA/ Constantinopolis
Circa A.D. 330-331
16mm 1.9g
Obv. VRBIS ROMA; Roma, helmeted bust left, wearing imperial cloak.
Rev. Victory stg. on prow, holding long scepter in r. hand, and resting l. hand on shield, seen from side.
In ex. PLG
Cf. RIC VII Lyons 241, 242
Ex 1989 Nether Compton (Dorset) Hoard