Japanese? Officers dagger

[USCG]

I am once again needing some insight from you wonderful gentlemen

I found this dagger amongst my fathers things and I have been researching it for weeks online and have only become more confused than when I started.

Any and All information you could give me about it would be greatly appreciated. (My father has Alzheimer's and can't tell me about it)

Thank you,
Michelle

[USCG]

Pictures

It helps if I remember to post the photos....

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[hc8mm]

Chinese WWII dagger

[Jareth]

I agree. Chinese Nationalist