That's a System/23 Datamaster. I, personally, have made reverse-engineering of the board and wrote a MAME driver. If you need assistance bringing it up to work just tell me.

That being said, from the pictures I can say the following:

* It has 16 system ROMs. So a late 5322 or a 5324.
* No DRAM card. We are working on a contingency for cases like this.
* European motherboard, as it has two oscillators.
* No jumpers on the configuration pins. I should take a look into what it does mean both in the service manual and the driver I wrote
* No keyboard. We are currently working on a contingency, although I was able to trick the motheboard to think it has one.
* No floppy disk controller card. If you manage to get it working, you won't be able to load or store programs other than typing them. The FDC card still needs reverse-engineering work.

Oh, and another thing. Dump the ROMs ASAP. The ones the System/23 carries are very, very nasty. They are the main cause of failure for this class of computer, other than RAM capacitors.

Finally, again I extend my hand to you. If you want to make it work send me a DM. I will put all the available resources I can, but only if you are willing to deal with the maintenance work yourself.