Bayonet with an elongated steel pommel with a vestigial beak, a T-shaped slot in the back and a prominent press stud on the left side that operates a locking catch via internal coiled spring. The pommel is flat and straight on the back, rounded on the underside and meets the grips vertically. The dark wood grips are attached to the tang by two dome-headed rivets with washers. The backs of the grips are flat and straight while the undersides are rounded and shaped to fit the hand. The steel crossguard is broad and the lower guard tapers towards a disc-shaped finial. The top guard is formed onto a full muzzle ring with a leaf-shaped extension that extends above and in front of the ring. The bayonet has a long, gently curved and deeply fullered yataghan-style blade.
The simple blackened steel scabbard has a mouthpiece insert with a short rim extension on the right side secured by a small rivet through the front and back. The loose frog stud is rectangular and waisted with a rounded end. The scabbard tapers towards a flattened round ferrule.
Appears to have been purchased with a Portuguese Kropatchek rifle, but accession entry is not explicit.