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.............Noice!........................

Now just imagine where that thing has been! :roflmao

Annnd there you have it folks!

Great work, Gents! :bow

bis·tou·ry (bis'tū-rē),
A long, narrow-bladed knife, with a straight or curved edge and sharp or blunt point (probe-point); used for...

I would say it is a quill knife. Likely part of a writing set.
Perhaps a reed knife for musical instruments?
A surgeon's tool?
The handle or scales appear to be tortoise or dyed horn.

Who...