Sextant with polished brass and gunmetal frame, polished brass limb, detachable wooden handle and fitted mahogany case, by Matthew Berge, London, England, 1810-1815. Consists of inlaid polished silver 131° scale (-2° to 155°) with 20’ divisions and vernier, four index-filter shades (red & green) and three horizon filters (red & green), scale magnifier on 80mm swivelling arm. Fitted with threaded telescope bracket for sighting telescopes (62mm – erect image 134mm – inverted image & 58mm – tube) and detachable silvered plate for reading scales.