This type is a bit rare for Constantine.
Constantine I
A.D. 311- 312
23x25mm 7.1gm
FL VALERIVS CONSTANTINVS PF AVG; laureate head.
BONO GENIO PII IMPERATORIS; Genius standing left, modius on head, naked but for chlamys over left shoulder, right holding patera from which liquid flows, left cornucopiae. in fields crescent over K/ A over X.
In ex. ALE
RIC VI Alexandria 145