Summary: this is a Microtech A.D.O. dagger, new in original box. Here's what you need to know:
"The A.D.O. (Alpha Detachment Operative) is an extraordinary fixed blade knife from Microtech. This ADO features a black finished double-edge dagger blade (plain) and handle with a waffle-style texture. This knife follows the design of Chris Reeve fixed blades with a hollow handle, accessed by unscrewing the glass breaker tip. It is made from a solid billet of stainless steel. The A.D.O. includes a composite sheath with a spring loaded tab to secure knife and a 2" steel clip for belt carry."
6 photos for review – as shown, the original box and paperwork included. Out of stock most places, my asking price is the best I could find. Neat piece – thanks and good luck.