Ontario Mark 3 Knife issued to Navy Seals. NSN#1095-00-391-1056.
The knife measures 10.75 inches overall, with a 6.5 inch blade (0.165" thick) which is black Parkerized.

The base of the blade is marked on both sides -- one side is marked "2V376", the other side is marked "MK 3, MOD 0". The sheath is marked similarly, "MK 3 MOD 0" and "USN". The sheath features a brass belt hanger and loop, and is made of a very strong but light molded polymer, and attached is a strap for fastening the bottom of the sheath to your leg.

The knife has a straight blade. The back of the blade is heavily serrated for cutting and sawing duties. The handle is marked "USN" in the middle of the deeply checkered handle, which offers an incredible grip. The butt cap is steel, and made for hammering and pounding. It has a lanyard through the cap.