My mother has something similar that sits in her kitchen drawer. They picked it up 30-some-odd years ago when we(meaning Dad and family) were stationed in Yokahama, Japan. Hers is larger, with each blade running in the 4-5" range if I remember right, and the wood is of a light color, with a black spacer on each handle where the two meet. Until now I have always just thought of them as steak knives( that is on the rare occasions that they see use)!!! Thank you for the pics, I had forgotten all about them until now.
Take care.
Andy