I was once told that to assume something will make an ‘Ass’ of ‘U’ and ‘Me’, a very helpful tip in the communications world. The assumption here, is that this unsigned piece is by Kosc. The evidence supporting my assumption is that NTS is a crew he belongs to, and he is the only artist I can think of who produces accurate anatomical pieces.
I am no expert, but looking at this magnificent skull, I would say the dentition suggests a grazing lifestyle and the horns would lead me to think this was an ungulate (a hoofed mammal). I would plump for some kind of bovine, possibly a buffalo of some kind, maybe an African buffalo. A lovely piece, and something a little different.