The handle doesn't seem to me at the same quality level of the blade, so it could be not original... I figure that somebody broke the original, probably better (horn or ivory) scales and substituted them with a piece of wood worked with his pocket knife and some other common tool. ...Just an idea, of course. The handle could be very old as well (especially because of the washers/pinning style, which, as far as I know, seems to be typically from the XIX century), so you could want to keep it...
A nice find, congrats!