So to answer my son's and perhaps your question.
"What's A Bar Knife" ?? It is a knife that is kept on your bar to slice a lemon, to put olives in the glass, obtain lemon zest and to open a beer bottle. (all without having to run to the kitchen and rummage through drawers.)
I am showing, one with an Oxhorn handle and the other, a Staghorn Handle. both are made with a quality Sheffield Steel blade with serrated edge and pick-up points. Approximate total length is 9 inches. In The Grenadier Collection velour box.