This is a knife bayonet manufactured in 1908 and used to about 1934. They were manufactured by various German manufacturers to fit the Brazilian 7mm Mauser of the same year designation. They are well made and can be easily used as a functional knife. There is one variant - unmarked - that is obviously of lesser quality and may have actually been fabricated in Brazil.
Single-edged, single-fullered blade; with wood grips.
These can be found with either a brass-mounted black leather or a "blued" steel-mounted black leather scabbard. There letters "FI" are usually present on the frog stud.