I'm trying to track down more information on a knife I acquired years ago, that has been variously identified to me as a WW2-era kaiken, kwaiken, non-regulation officer's dirk, or kamikaze dirk. The blade appears to be machined mill steel, but does have a real hamon. The nakago is short, less than half the length of the tsuka, with no mei. There is an inscription on the tsuka, for which I'm seeking a translation in another forum. Kojiri and kashira are horn. Fuchi, koiguchi, and mekugi appear to be bone. Habaki appears to be multiple pieces soldered. Any information is appreciated.