looks a clumsy one to me, blade has no distal taper for starters.
It isnt Japanese even at the very lowest tourist level I am sure.
The Jap. Army took swordmiths with them during world war 2 for repair, modifying etc. , it realy doesnt look remotly like thier work though, by any stretch of imagination.
Its as genuine Japanese as a $1 ebay piece from Shanghai.
Spiral