I think it's a specialised anti-yukkuri claymore. Says Front Toward Yukkuri (I think) instead of Front Toward Enemy. Plastic ball bearings fired with rubber band should be enough to kill most yukkuris.
So basically a human should head butt it to be seriously hurt.....by chance you didn't mean bodied yukkuri right? you know, only someone dumb as a yukkuri would headbutt a claymore...
^I laughed my ass off until I felt stomach ache when I read "Do not attempt to stop the spinning blades with hand, face or penis" on my fan's instruction.