This is a knife bayonet manufactured from the period of 1889 to about 1917. They were in service until after WWII. They are well made and were the prototype for - and therefore very similar to - the U.S. Krag-Jorgensen knife bayonet.
There are two other known Swiss variants: designated the Model 1889/99 and the Model 1889/11, the differences being with the in-scabbard-locking-mechanisms designed into the blade fullers.
Extremely well-made, single-edged high-quality steel blade, wooden grips. Blades are usually marked with the Swiss manufacturer, "WAFFENFABRIK NEUHAUSEN"; Neuhausen is a Swiss city located near the German border.
This bayonet was designed to fit the Swiss Schmidt-Rubin Rifle of the same year designation.
All-metal "blued" scabbard, with leather frog "tongue."
Model 1889/11 shown.

Switzerland declared itself neutral in both world wars, and had zero military involvement; reportedly, they did not supply the German military with any weapons, equipment, or accoutrements.