Constantinople Commemorative. 330-335 AD. AE follis. 

Obv: CONSTAN-TINOPOLI, laureate and helmeted bust of
Constantinople left, wearing imperial cloak, holding 
reversed spear
Rev: GLOR-IA EXERC-ITVS dot, two soldiers holding spears and 
shields with one standard between them, o on banner, CONSZ 
in ex. 

RIC VII Constantinople 155, rated R4. 

The rarity of this coin lies in the short obverse legend and the dot at the end of the reverse legend.

Contributed by Dane for George Clegg (biggyg2), June 2009