Vintage 1972 Nautical sextant with original case. Cooke-Hull # 3754, made in Britain. All metal construction, brass, steel, aluminum. Worm gear fine tuning. It's the Real Deal! 6 adjustable sun shades, 6x primary magnification. 8.5 deg field of view, aperture 1.2". All components are adjustable for fine calibration. This sextant has a wider field of view than others I have used, making it easier to find the celestial body you are looking for. There is some oxidation and paint chipping on the frame - does not affect function. Recently calibrated. I also have digital calibration instructions, included.