You've found quite an unusual item here.  It is a custom-made bassoon reed knife, left-handed.  This is my first attempt at making a knife from scratch.  It was intended to be for my own use, but I screwed up and ground it backwards, so it came out left-handed.  The blade itself is A2 tool steel, heat-treated and hardened.  It was roughed out on a belt sander, but all the finish work was done by hand.  It's not perfect, but my teacher and I think it came out quite nicely.  It is razor sharp, and should hold its edge for a long time.  

I added a brass thumb rest, made on my CNC mill, which I feel helps to control the shaving action.  I also turned the handle myself, which is black walnut with a nice satin wax finish, on my lathe.  To complete the package, I tried my hand at leather working to make a custom-fit sheath, hand stitched, with an oil finish. 

Dimensions:
       End to End Length - 7.5"/190mm
       Blade Length - 3.625"/93mm
       Blade Width - .969"/24mm
       Blade Thickness (at thickest point) - .219"/5.6mm
       Thumb Rest - .719" x .562" x .219"/18mm x 14mm x 5.6mm
       Handle Length - 3.875"/100mm
       Handle Diameter (at widest point) - .812"/21mm
       Weight - 4.6 oz./130g 

Since I can't really use the knife, I'm offering it for sale at auction, with bidding starting at only $50.  This is a steal, as it barely covers the cost of materials for this one-of-a-kind tool, let alone the time and labor put into its creation.  I'm happy to answer any questions.  If you like this, please check out my other creations at flonklarguitars.com.  Thanks for looking!