Dirks were traditionally single edged, often made from cut down/broken backswords. Something like that could, perhaps, have been carried by a poorer highlander pre 1746 but I'm not sure your knife looks that old. Once highland arms were legal again in the late 1800s they became a lot more ornate, being an 'authentic' highlander was a game for the well off!
My first guess based on looks and age of the wood would be a WWI trench raiders knife, but it's just a guess. I'm definitely not an expert.
Robert
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