Constantinopolis City Commemorative. AE4. 333-334 AD. Trier. 

CONSTANTINOPOLIS, laureate, helmeted and mantled bust of
 Constantinopolis left, holding sceptre

Victory standing left, foot of prow, holding transverse sceptre and leaning on shield. 

Wreath in left field. 
Mintmark TRS. 

RIC VII Trier 554, rated C3.

With permission of Roma Numismatics, October, 2009