Constantinopolis Commemmorative AE4. 

Obv: CONSTAN-TINOPOLI, Bust of Constantinopolis left wearing pearl-diademed 
 helmet, imperial mantle and holding reversed spear. (Bust type N2) 
Rev: Victory standing left, foot on the prow of a ship, holding scepter and 
 resting left hand on shield. Mintmark: SMKx 

RIC VII Cyzicus 108, rated R5 (!). 

Contributed by Dane, August, 2006.