...this is actually a French Model 1866 Chassepot yataghan-style bayonet (known as the “baïonnette modèle 1866”). There are a few identifying characteristics to confirm this:
The bird-head / beak pommel is iconic for the Chassepot bayonet family; it has a German-style ribbed brass grip that French 1866 bayonets used with longitudinal ribs identical to yours. The quillon crossguard has a forward curl, some which were later shortened or bent inward in service and it has a press-stud lock above the guard, which was used to mount this to a rifle. Additionally, it appears to retain its original scabbard (leather-over wood) with brass throat and chape
The marks on the crossguard are unit (regimental) markings and the rack / inventory numbers on the scabbard throat. These stamps are textbook examples of late-19th-century Germanic-style unit marking practice. Even though your bayonet is French in origin (Model 1866 Chassepot), huge numbers were captured in 1870–71 during the Franco-Prussian War and then adopted into German service, at which point they received German unit stamps like this.
The crossguard markings "167. R. T. 1. 2" can be translated as "167. R. = 167th Infantry Regiment (R = Regiment); T. = Truppenteil (sub-unit), or sometimes Train (support element); 1. = company number; 2 = weapon number / rack number within that company" In short, this was the Weapon #2 of 1st Company, 167th Infantry Regiment (
To read the scabbard throat marking "27. A. 3.50"
This is a later re-issue — scabbards and bayonets were often reassigned to different units and likely reads as "27. A. = 27th Artillery Regiment; 3. = 3rd Battery; 50 = weapon / rack number"... this means that later in its service life this Chassepot bayonet served with German artillery units. It is very common to see multiple sets of unit marks on bayonets that saw decades of service because during the Franco-Prussian War (1870–1871) Germany captured hundreds of thousands of French M1866 bayonets — so many that they were officially adopted for reserve units, fortress troops and artillery.
The little tiny numbers/letters on the pommel (dots, stars, inspector letters, etc) are French proof and acceptance marks, usually from the manufacture arsenal. The German army then stamped unit marks onto them to integrate them into inventories.
On the blade spine (when drawn), there is usually an arsenal inscription such as "Mre d’Armes de Châtellerault", "Mre de St. Étienne," "Mre de Tulle," and "Mre de Klingenthal"…and a manufacture year...