You are getting a Wilkinson Sword Lanyard Rivet made from stainless steel for the CSK185 Dartmoor Survival Knife. It was obtained from the Wilkinson Sword factory, on closure.
It fits into the Handle and serves 2 purposes; it holds the Pommel Locking Nut in place. It may also be used for threading a lanyard through the handle.
The Handle and Pommel Locking Nut are available separately.
It is in unused condition.