Luckily for you, we have many cointalkers that hang out in the Late Roman Bronze world. I am not one of them... someone will be along shortly.
The name is clear on the obverse followed by IVN which means junior. That is followed by an abbreviation for noble Caesar. The mintmark is also clear. When looking for a match, pay attention to the fact that you have two standards between the soldiers (not just one).
I had never heard of numista so I went looking and see no reason for an ancient collector to visit it. Try acsearch. https://www.acsearch.info/search.html?id=2484458
Welcome! That is a nice looking ancient Roman coin. I like the bust of the emperor, is that armor he is wearing? I would call that a really nice example. John
Nice coin OP and Welcome to the Forum. I also believe it to be Constantine II, The NOB C part of the obverse legend means it cannot be Constantine I.
https://en.numista.com/catalogue/pieces57290.html is this it? there are some small differences but it might still be acceptable variation
That star versus dot business might seem like we're getting picky, but the ancients used devices like that in the designs to distinguish various production series over time. I just got my knuckles rapped for using an older standard reference for dating these from Lyons than the current favorite (in French), so I will let Victor tell you the year dates when the time comes. But you can see something of this for a different coin type but the same mint as your coin toward the end of the following thread: https://www.cointalk.com/threads/another-vrbs-roma.304967/page-2 Edit: I just noticed in the Numista page referenced, that the star/dot distinction and the officina designations are included in their list for this reverse type.
It depends on how important those variations are to you. This Numista entry appears to be a fairly generic "bucket" type listing for Constantine II as Caesar "Gloria Exercitvs" coins from Lyons which encompasses several RIC numbers and several slightly different coins. To me, this listing encompasses several different coins and I would not consider it acceptable but if you absolutely have to use Numista to organize your coins(which I don't recommend if you want to collect more ancients) then it may work for you.
i was actually looking at the standards mine have squares with circles in them towards the top, but the numista one doesn't
the banner elements can vary greatly, but these differences do not change the catalogue number, which I would not worry so much about yet, unless you already have RIC VII. The circular objects on the standards are Phalera, which are sculpted discs which were awarded for various military exploits.