Box chronometer, used in navigation to find a ship's longitude at sea. Made by T.S. and J.D. Negus, No. 586. An immigrant, Thomas S. Negus began making and selling chronometers in New York in 1848. In 1864, 100 Wall Street was listed as its location, and it became Thomas S. and John D. Negus in 1869. The company continued into the 1960s. Down Easter captains bought these if they could afford them.
New York, New York
T.S. and J.D. Negus