East Roman Empire [решено]

I would like help with this Byzantine (?) coin I bought. Its weight is 2 grams and length 23.55 mm and width 25 mm.
I bought it in Athens, so I guess it may be from Byzantium. On the obverse, I can see a male figure (and maybe another one next to it).
Reverse:

Obverse:

It is a Trachy nomisma (cup-shaped, so I think it is 11-13th century).

Not completely sure about my identification; those coins are a bit tricky.
Even if I collect them, I always have hard times with them and I must admit Quant-Geek is much better than me.

However I think it's an anonymous trachy made by the Latin rulers of Constantinople (Latin Empire) : Sear# 2023.

Observe (first picture) : Mary nimbate, seated on throne with Christ on breast ?
Reverse (second picture) : Emperor seating with a sceptre in its right hand and an orb in the other one.

This coin is not on Numista and no sections have been creating yet for this coinage, so I invite you to temporarily add it under the Byzantine Empire.

Edit : an example here http://www.wildwinds.com/coins/byz/latin_rulers/t.html

Thank you very much sir. Merry Christmas and happy 2019!

Thanks !
Merry Christmas to you as well.

All the best for 2019 !