This is a fine example of a late roman pugio, made after the ones found in Doura Europos (256AD). With its long, though blade, it was certainly a deadly weapon to be used agains scale armor. It was probably weared horiztontally under the belt.
Steel blade, wooden grip, brass pommel. Scabbard made of wood covered in leather with a brass plate. Length 31,5cm, blade 20,5cm. Weight 200g.