This kind of dagger was favoured by seamen of Anglo-America at the age of sail. I think that the not-so-perfect work utilizing scattered parts of high quality usually stands for self-made composite daggers of that period, the pommel looks to be taken off Georgian flatware. The braided silver wire in "ocean mat" pattern was a popular marine motif. Similar daggers can be seen in Peterson's American Knives and Daggers and Fighting Knives of the Western World; Neumann's Swords & Blades of the American Revolution.
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