Constantine I AE Follis. Trier mint, 310-313 AD.

Obv: CONSTANTINVS P F AVG, laureate, draped and cuirassed
bust right.
Rev: MARTI CONSERVATORI, Helmeted and cuirassed bust of 
Mars right, star on helmet earpiece (not in RIC).
No mint mark

RIC 885 var (star on helmet).

With permission of Paul-Francis Jacquier - Auction 40, Lot 508, Oct. 2015