SOLD -Featured below is a rare early example of genuine pocket sextant or "box sextant" used by explorers for navigation. This piece was made in 1918 by the British scientific instrument maker Newman & Guardia London. The anodized brass cylindrical body has several fine adjustments: index arm, magnifying glass, two mirrors, adjustable green and red filters and a silvered vernier scale with very fine markings (0-130). The the brass case a nice patina and some wear and tear due to the age and a small ding on the back side.The reading can be taken through the peephole, who has a black sliding sun filter. The inside case still has the original Natural Tangents printed paper. The sextant has unusually small dimensions: 65 mm diameter and 35 mm height.