either this:
https://de.msi.com/Motherboar...

or this:
https://de.msi.com/Motherboar...


or something similar. But these are the two that MSI has on offer and probably also installs in its machines.

The way I remember it, it should be an itx or even a mini itx. In any case the Intel B250
You can download the specifications here:

https://de.msi.com/Desktop...

Kind regards

Unfortunately, there is no more information available as the item is sold out with us. I'm sorry. But I'll be happy to enter it in the community, maybe a user can help you. :)