Well, I don't think anyone could identify it positively without good close-up pictures. But years ago the Western boot knives were common, and the lines of the knife and especially the sheath clip appear to be a good match. Look closely, well as close as possible anyway, at the shadows on the exposed tang of Bulger's knife that hint at the blade shape and the size of the pins. I can't make out the 'eared' guards though.