Most of the Fataliis I have seen have a pointed tip. That looks a bit more like a datil pepper to me. Dont let me lie to you though. Theres bound to be somebody on here who knows for sure.
The Foliage doesn't look like any chinense i have growing.
the the skin looks liek it is too thick.
what does the tip of the pepper look like if it has multi tips it could be a pepperoncini they seem to have that charaqterisitc. maybe a yellow jalapeno would be cool how is the heat?