This coin just sold for 328 Euros. It has a laureate helmet, though RIC VI only lists a plain helmet, but notes for other of this type “Helmet may be laureate, or decorated.†(pg 250 note 12, pg 251 note 3) Bastien, however, properly calls it a laureate helmet (casque lauré)
Constantius I
A.D. 301- 303
31mm 10gm
CONSTANTIVS NOB CAES; laureate helmet, cuirassed, sceptre over right shoulder, shield on left arm.
GENIO POP-VLI ROMANI; Genius standing left, modius on head, naked but for chlamys over left shoulder, right holding patera, left cornucopiae; A in right field.
In ex. PLG
RIC VI Lyons 141, Bastien 160