Miniature suicide dagger where the handle screws in half and does have a small compartment that would have fitted a poison pill. The handle seems to be cast and this comes with a very well constructed leg or wrist sheath with o ring retention strap reminiscent of the pancake flapper retention rings. Pete Mason attributes thumb knives marked "B 2" to Sanderson of Sheffield. marked B2 on the guard. Purchased From author Leroy Thompson and comes with a COA. pictured and spoke of in the Spring 1996 Tactical Knives magazine in Leroy's Article "The miniature fairbairn Sykes: At Last, The True Story"