Treveri (Trier) mint, A.D. 310-313 (313-315?)
Obv: CONSTANTINVS P F AVG
Rev: MARTI CONSERVATORI - Helmeted and cuirassed bust of Mars, right
(No mint mark)
19 mm, 2.9 g.
Note: Roman Imperial Coinage (RIC), volume VII, does not include this
reverse type--or the bust of Sol reverse--in the issue of coins
minted between A.D. 313 and 315, yet the weight of this coin suggests
that it was probably struck during this later period. See footnote 2 on
page 150 of RIC, vol.VII.