This is a Pioneer's or Engineer's bayonet manufactured from the period of 1914 through WWI. They are exceptionally well made and saw-teeth extremely sharp.
This bayonet is very similar to earlier Swiss saw-back bayonets - namely the Model 1878 and 1887 - as well as German saw-back bayonets of the period.
Extremely well-made, single-edged high-quality steel blade, wooden grips.
Bayonet was made for the Schmidt-Rubin Carbine and was issued to Pioneer or Engineer troops for tasks such as clearing brush, construction, combat (if necessary), etc.

Overall length - in scabbard - is ~24-1/4";

Hilt is ~5" in length (including crossguard), ~3-3/4" at widest point (crossguard); nickel-plated steel furniture; serial number is found on the cross-guard.

Straight saw-back blade is ~18-7/8" long, ~1-1/8" wide at swell-tip; single fuller on one side of the blade only, opposite side of blade is flat; 33 saw-teeth on left side of blade, 32 on the right, sharp and functional.
Most common manufacturer's mark is "WAFFENFABRIK NEUHAUSEN" and is found on the blade ricasso (right side); Neuhausen is a city located in Switzerland near the German border.

Scabbard is ~20" in length. All-metal "blued" scabbard, with leather frog "tongue;" rolled-sheet-steel with ball-finial.

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.