That's a greek orthodox cross. It looks byzantine, possibly greek. I don't read the language on the coin.
I found this on a website talking about european history
Sv. Ciril in Metod, 863-1963
Sv. Ciril in Metod, 863-1963
)
- "Jubilee of St. Cyril and Methodius". (According to tradition, they brought Christianity to many of the Slav
tribes. This was - you guessed it - in 863. Hence the "jubilee" part.)