antique carving knife w/ ivory celluloid handle, blade marked Landers Frary Clark

Beautiful Victorian era carving knife with old carbon steel blade marked Landers, Frary and Clark, Aetna Works. I think the ivory colored handle is celluloid? Doesn't look quite like a bone handle to me.

The blade is 10" long, and has a little rust spotting though the edge looks fine. Knife including handle is about 16" long overall.