Constantine, AE4, posthumous issue. Cyzicus. AD 337-340. 

DV CONSTANTINVS PT AVGG, veiled head of Constantine right.
No legend, Constantine in quadriga right. with the hand of God reaching down to him. 

Mintmark SMK Gamma X. 

RIC VIII Cyzicus 25.
Rare.

With permission of cngcoins.com, Jan. 2014.
Estimate: $100.