Hello, what I see in these pics is a period WKC navy dagger with hammered scabbard and dolphin etching. Portepee seems original to this piece. Like the engraved eyelets which, due to my personal experience, fit to an etched blade, the same with the hammered scabbard tip (those without engraving and hammered scabard tip have an unetched blade - which imho some few collectors without proper experience like to classify as postwar).
The scabbard has some small bumps but is still in good collectible condition. Blade is VERY nice.
Regards,

wotan, gd.c-b#105

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