细节
A 19th-Century oxidised-brass drum sextant,
unsigned, with two shades, silvered scale, vernier and magnifier, two-draw telescope, the screw-on cover forming the base -- 3 1/8in. (8cm.) dia.
unsigned, with two shades, silvered scale, vernier and magnifier, two-draw telescope, the screw-on cover forming the base -- 3 1/8in. (8cm.) dia.