This bust type (B4) is not listed in RIC for this issue, only laureate and cuirassed (B5). It should come before Lyons 233. However, it is apparently an error in RIC and 233 should actually be listed with a B4 bust. Bastien lists this type as #191 and not in RIC, but in his footnotes states that the one example cited by RIC in the Berlin collection is not in very good condition, making a difficult interpretation. In RIC, there is even a footnote that Voetter recorded the same bust (B4) and legend in the Gerin Catalogue, but Bruun did not find the coin in the Vienna collection, so once again, he doubted Voetter.
So, not in RIC, but it seems likely that it is actually Lyons 233
another example-
http://www.notinric.lechstepniewski.info/7lyo-233.htmlConstantius II
A.D. 326
18mm 3.5gm
CONSTANTIVS NOB C; laureate, draped and cuirassed bust right.
PROVIDEN-TIAE CAESS; campgate with two turrets, star above.
In ex. PLG
RIC VII Lyons
