That is no kind of "dirk" I've ever seen. As a rule, a "dirk" is a long, straight bladed and generally double edged knife with a straight cross guard. I have to agree that appears to be some sort of cut down mounted service or officers sword.

Re the "bezel" I would have sworn he meant "bevel" but I looked it up before typing my opinion on it (thank goodness) because his definition is dead on.
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