This appears yo be a ken. But I cannot distinguish clearly the hamon so I wonder if it really is nihonto. The signature also looks strange, at least on one side.
The oxidation of the tang looks like fairly recent production. My guess would be Showa wartime.
I am not familiar with this type of koshirae but it definitely is not aikuchi. And most likely it is not Japanese.
PS: Maybe you should address this to a forum specialised in nihonto, like Nihonto Message Board.