Hello, with the small "dots" in it, it does not look like ivory to me but, as Mikee stated already, looks like bone (perhaps whale bone?).
Perhaps a standard 1890 (with the closed final) cadet pattern? But the two anchor crossguard here differs.
Regards,

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.