This Constantine VLPP from Trier is rated r5 (one example noted) in RIC and is actually pretty rare. The left facing bust is what makes it so rare.
Constantine I
A.D. 319
3.5gm
IMP CONSTANTINVS MAX AVG; laureate helmet and cuirassed bust left.
VICTORIAE LAETAE PRINC PERP; two Victories stg., facing one another, together holding wreath inscribed VOT PR on altar.
in ex. STR
RIC VII Trier 214
