Konnichiwa Gunnar-san!
I also think this is a fake sword.
1.Surface pattern is a damascus but not Tanren-hada.
Damascus Pattern
Tanren-hada
Click ▼ to see the explanation
2.There is a ring for hanging the sword on the top of the sheath. But the sheath of a Japanese sword originally had a ring "Kurikata" on the side.
Kurikata
Japanese army and navy swords have a ring on the top of the scabbard. Because it's hung on a Western belt. Especially the navy favored short swords.
Navy short sword
Of course, no animals are depicted on the sheath of a military sword.
Japanese
Samurai with sword hanging from his obi belt "Kimono Obi". Japanese Kimono don't use a Western belt, and Samurai sword had a ring "Kurikata" on the side.
Kimono Obi
3.Do not carve owner's name on the surface of sword. The name is carved into the stem generally.
Engraving Kokuin
Blade Engraving Toushin-Kokuin
4.There are two Family Name "Sasa" and "Oda" on the blade engraving, it's unnatural. Because Japanese people use one family name.
5.There is a picture of a moose on the sheath. But Japanese moose became extinct 10,000 years ago.
Moose
Japanese deer
NANGI