细节
A lacquered-brass box sextant
by Troughton & Simms, with silvered-scale and vernier, magnifier, telescope and shades -- 2¾in.(7cm.)diam., in fitted leather case (2)
by Troughton & Simms, with silvered-scale and vernier, magnifier, telescope and shades -- 2¾in.(7cm.)diam., in fitted leather case (2)