This is a Swiss engineer bayonet M1914; from the armory Elsener Schwyz with the number 642086. This one has a sawback and it's a very rare piece. It fits to the 1896 and 1911 repeating rifle. Todays price of this bayonet is around 450/500 US$. Size of the blade is 50cm (20"), and the grip with cross-guard is 14cm (5.5"). Most M1914 bayonets I found in the Internet have damages at the blade. This one is in best condition. The grip is of steel and wood, the scabbard is of metal, and the bracket is of leather. Year of construction is early 20th century.