I've seen this type of blade before. It's a reworked 1880's British Metford bayonet :
The scabbard is from a Czech VZ24 bayonet.
JEDEM DAS SEINE
I would say the blade is from belgian 49 SAFN and scabbard is more likely Austro Hungarian M95
Possibly a handmade of some sort
thanks for replies
so, probably a "home-made" knife
same opinion scabbard is probably austrian M88/90.
Indeed, Belgian it must be. Blade shape is quite similar to the Metford.........!