This coin, which sold for $261.33, is not listed in RIC with this bust. It should come before Arles 25. It is in Ferrando (#347), though.
other examplesConstantine I
A.D. 313- 315
20mm 4.0gm
IMP CONSTANTINVS P F AVG; laureate, draped and cuirassed bust right.
MARTI CO-N-SERVATORI; Mars advancing r., transverse spear in r. hand, trophy across l. shoulder.
In ex. TARL
RIC VII Arles--