City commemorative AE Medallion, Rome, struck under Constans or Constantine, AD 330-346. 

CONSTANTINOPOLIS, helmeted and mantled bust of Constantinopolis left, holding sceptre over shoulder / VICTORIA AVGVSTI, Constantinopolis turreted, seated left, 
holding branch and cornucopiae. 
No mintmark. 

RIC Rome 358; Gnecchi 12. (both describe Constantinopolis as winged).
Very rare.

Sold by Jesus Vico S.A Auction 143, Lot 738, Nov. 2015.
Starting Price: 4,000 Euros.