looks like an oldie but goodie. Bet it holds an edge good
It's a Japanese Deba knife. Intended for carving up a fish. Thick blade for cutting bones, chopping fish heads off, boning, etc. Don't tell the Japanese, but I also find my Deba useful for cutting a whole breast off the Thanksgiving turkey before I turn to more of a slicing knife to cut thin slices.
The knives rust like crazy, have to be wiped after every use. They are typically hard and brittle, easy to chip. Not a knife that will take a lot of abuse. Properly sharpened, they will cut your finger off. I never let my wife or daughter near mine.
Here's a little primer:
http://korin.com/Learn/About-Japanese-Knives