Unknown Byzantine-looking

25mm
5.3g
concave
looks like silver

I am thinking Byzantine, Bulgaria, Hungary or even Venice, but cannot find it.
Any help would be much appreciated.

Thank you!

Seems to be this:-
http://www.wildwinds.com/coins/byz/romanus_IV/sb1861.txt
but of course it may be a fake.

It looks a bit strange to me. The surfaces seem cast.

Thank you for your responses.

Based on what you linked, Bitteswell, I found it also on this website:

https://en.numista.com/catalogue/pieces93282.html

However the ones in the catalog are mostly made of gold, and I agree, Choucas, that it does look different, perhaps a replica made some centuries after this. How can one tell?