Roman..

Ik heb geen idee wie dit kan zijn.  
 

 Lettering is  CRISPUS  above portrait. 

What is the diameter? 

What is on the other side? 

probably BEATA TRANQVILLITAS for Trier :

https://www.nummus-bible-database.com/monnaie-106557.htm

🙂

 I made this with lettering 

something like  IVL CRISPVS NOB CAES  perhaps.

 Ah, while I was doing that I now see another reply. 

Looks like lettering matches - still need to see the other side. 

 Seeing what is similar on here. Found this 

N#132605 

If you want to know who's depicted on the coin, it's Crispus, the eldest son of emperor Constantine I. He was caesar under his father from 317 to 326.

Looking at the legend and other obverse details, we can narrow it down to 7 types in RIC. Six of these were minted in Trier (Treveri) with legend BEATA TRANQVILLITAS on the reverse. These six types are differentiated by the reverse details, particularly in the exergue. The other type is from Siscia, has an entirely different reverse, and is much less likely.

Manivelle, it's up to you to show us the reverse side of your coin if you want us to positively identify the type.

ZacUK

 Seeing what is similar on here. Found this 

N#132605 

 

Just wanted to point out that that page covers a few different types, which makes sense since the differences are only in the exergue on the reverse. But it's certainly not RIC VII Treveri 307, which has a different breakdown within the altar: VOT/IS/XX instead of VO/TIS/XX.

Edit: went ahead and submitted a modification request. ☺️