Bayonet-Knife for use on the 5.56 mm. NATO caliber M16 assault rifle.
The "UAE" marking and Army Crest seemingly identifies them as from the United Arab Emirates. There is some evidence to support this, however, we consider the identification to be speculative at this point.

The crest on the opposite grip represents the UAE Armed Forces. The falcon (not eagle) is a common Middle East symbol of strength and the seven stars represent the Seven states making up the UAE. The Arabic at the bottom of the crest is Mashat Furat (Armed Forces).

A run of Rolex watches (real ones, not fakes) were produced with this same crest on the dial.

The scabbard markings are spurious. 8448476 is the U.S. Government part number for the M10 Scabbard. The CAGE Codes:

—19204 belongs to US Army, Rock Island Arsenal.
—9A148 belongs to NorcaTec LLC, a New York firm that produces spare parts for military aircraft, naval equipment, and armored vehicles.

Although these resemble the Ontario M7-B bayonet, they are not made by Ontario.

Blade 160mm
Overall 300mm