Maritime History.- Letter of marque issued by the Admiralty to Captain David Browning, commander of the ship The Viper, large manuscript document in a clear clerical hand, brown ink on Whatman laid paper, with watermark, signed at the foot by Thomas Cox and Thomas Brookbank junior of the high Court of Admiralty of England, and Godfrey Lee Farren registrar, small holes to folded corners, age-related toning as usual, folio, 6 June 1779.