Well observed, Jim.
Not only is the hilt of the sword the chief is wearing identifiable; the entire sword is clearly Ottoman work of the latter 17th century, right down to the belt.
Pity more period portraits aren't as well-drawn and detailed as this one.
Ottoman weapons weren't common but they were known (and sought after) in W. Europe. Plenty of W. Europeans traded with or fought the Ottomans in Eastern Europe, notably Captain John Smith (1580-1631) of Jamestown (and Pocahontas) fame.
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