It is the SA Hunter from Gareth Bull. A custom maker from South Africa.
Here is a visit to him last year when I picked up the Small Warlock (top knife in picture).
I have a new one on order, it might arrive this week or next week depending on time available for him to finish. It is a refined model of one of his previous models. I will post pictures when I get it.
On the SA Hunter
Here is a link with plenty of pictures to look at.
Here is a full review.