Help me to understand what tha hack this is

As all my frends know that im a geek of sharp things, and I sharpen knives as a hobby. Frend of myne gifted me this incredible thing. im trying to understand what it is and what price it can have , Honestly the pakage tells me that tis was/is a valuable tool it is as sharp or more than a rasor . the metal is solid hardned and high quality and probably have a lot tof carbon becaus we can see the rust.