I edited my post,,,look back. Crispus is only recorded for this variety with the obverse legend CRISPVS NOB CAES. Only the kids named after their fathers get IVN (Junior), meaning Constantine II and Licinius II.
Here are 2 others of the same number or category. I think I need to soak them a little bit in distilled water.
Valentinian is a name that you can usually assign to a number by the reverse. The majority of late Romans can be narrowed down a lot if you use the clues offered by a lit of what types each ruler used. One of the Valentinians was among the most prolific issuers of boat type coins; the other two had none. If you go to an online resourse like acsearch and type 'Valentinian boat' the question will be answered. Type 'Valentinian helmet' and the answer is the same.
So it appears we have all the campgates except #41 with five layers, no doors, and chi-rho above. I didn't find any wonderful examples of the type, but here is one from WW of Theodosius I... Here is an anipigraphic star-within-wreath of Helena, also issued by Fausta. An example from CNG that checks off #51...
Charles, Doug, and Eng have checked off 52, 53, and 54. Concerning the Trier issues of #54 and the Revolt of Poemenius, I discovered this VERY informative and interesting thread on FORVM. I don't need to add anything to it, other than encourage its reading. Bruck tells us that #55, large chi-rho within wreath, is an Arles-only issue. It's apparently quite rare. I could find no trace of one on the web, other than this one being offered on vcoins at the moment, Magnentius...