According to RIC, Lyons 92 has a diademed bust. Bastien, however, notes that the Paris example cited in RIC actually has a laureate bust.
Constantius II
A.D. 348- 350
16mm 2.5g
D N CONSTAN-TIVS P F AVG; laureate, draped and cuirassed bust right.
FEL TEMP REPARATIO; radiate phoenix on globe.
In ex. SLG
RIC VIII Lyons 92 corr.; Bastien 100