This is my gorgeous Rob Bayley survival knife, about ten years old, as confirmed by direct communication with Rob, and in excellent condition. Rob didn't authenticate anything at that time, hence there is no leather 'certificate of authenticity'. It is a one-off 'Evolution' model, a forerunner to Rob's chunky S5's. It is in 5.2mm RWL34 with secondary hardened H/T. There were only four S-type Evolutions: two 5", one 6" (this one) and one just over 7". So this is truly unique. Price is £700 net to me, or make me an offer.