1889 experimental Forest Guard? Nagant?

knife

Description

Unique experimental Belgian bayonet – a result of some experimental work from years 1888-1891. In Vial one can find 2 more variants one the same page. Maybe this was for Nagant rifle, others say it is forest guard bayonet. I would be grateful for clearing these doubts if someone has information. As Vial mentions there are two variants – the one in better shape has slightly narrower blade and barrel ring in distance from handle back.