Antique Sextant by Negretti & Zambra, London – 19th Century, Original Case. An original antique sextant manufactured by Negretti & Zambra, London, a renowned British maker of scientific and nautical instruments active during the 19th century. This finely crafted maritime navigation instrument was used to measure the angle between celestial objects and the horizon, enabling sailors to determine their position at sea. The sextant features a beautifully engraved arc scale and retains its original patina, reflecting its historical authenticity. The instrument is housed in its original wooden case lined with red velvet. The interior shows signs of age and use, consistent with its period. The sextant appears largely complete, including its telescope and adjustable components. Condition: Good antique condition with visible wear consistent with age and use. The wooden case shows wear and the velvet lining is worn and stained in places. The instrument itself shows minor oxidation and surface wear but remains a fine collectible piece.