This unlisted coin, likely struck late in the Group IV series (December 308 to May 310), i.e from around the time when Constantine was 'negotiating' his title / position in the Imperial College has a number of interesting aspects.
Obverse:
FL VAL CONSTANTINVS PF AVS (sic); Laureate bust right, traces of moustache
Reverse:
GENIO CA - E - SARIS CMH ligate, in exergue SMNГ, Genius standing left, chlamys over left shoulder and holding patera in right hand from which liquor flows, cornucopia in left
Weight 5.97 gm
1. Obverse legend unlisted for this type at Nicomedia, which was allocated to Maximinus II (
NOB CAES - RIC 55) and Constantine (
FIL AVG RIC 56)
2. Obverse legend unlisted at all for Nicomedia; when Constantine was raised to Augustus in the following issue (
GENIO AVGVSTI CMH) - RIC 66d, the obverse legend used was
IMP C FL VAL CONSTANTINVS PF AVG3. The engraving error, S for G is also known for RIC 56, i.e. coins with the
FIL AVG legend, see not in RIC:
http://www.notinric.lechstepniewski.info/6nic56v.html