original WWII Japanese Naval Dirk Dagger and Scabbard marked on cross-guard

WWII Japanese Naval officers Dirk Dagger in very nice original condition. As visible in pictures, there is some tarnish present on metal areas, mostly to metal on scabbard. Cross guard is marked, but I do not know the marking. Marking is visible in picture. Blade measures 8 1/2" from cross guard to tip, including habaki, and overall length of dagger is 12 7/8", with total length being 16" with dagger locked in position inside scabbard. This was a standard issue dagger with Ray Skin simulated plastic handle. Handle does have one very thin split about 3/8" long extending from pommel, which is visible in picture. I have included many pictures of the dagger to show all areas and actual condition. Please contact me with any questions.
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