This is a pretty good copy of a Lyons issue, though the first half of the reverse legend is a bit rough.
Magnentius
A.D. 350-3
23mm 3.8g
D N MAGNEN-TIVS P AVG; diademed, draped and cuirassed bust right.
[FELICITAS REI]-PVBLICE; Emperor standing left holding Victory on globe in right hand and labarum.
In ex. •RPLG
cf. RIC VIII Lyons 116