Here's an example from Constans, but it is unofficial. In the mintmark the S is retrograde. Overall the style is pretty good, but compared to the second example above, the Victory on the reverse is also a bit crude. It makes me further believe that the first example is also unofficial. The Victory on both the 1st and 3rd are really similar, and they seem clumsy compared to the 2nd example. Bastien has four examples in the plate coins and though the pictures are small, the Victories look similar to the 2nd example.
I have attached a picture of the three Victories for comparison. Note how clumsy the Ist and 3rd look compared to the 2nd- the arms holding the wreath are strangely angled, the eyes are big dots, like bug eyes, the lines seem thicker and heavier (also look at the hair on the obverse of each) and the helmets on 1 and 3 are made with lines...overall the 2nd example is just better engraved; and while the 1st and 3rd are not bad, neither looks as good as #2.
Constans
A.D. 342- 343
13mm 1.1gm
CONSTANS P F AVG, rosette- diademed, draped and cuirassed bust right.
VICTORIA AVGVSTORV; Victory walking to left, holding wreath and palm.
In ex. SLG
cf. RIC VIII Lyons 37