A GEORGE III TWO-DAY MARINE CHRONOMETER IN OCTAGONAL MAHOGANY BOX John Arnold & Son, No. 18, circa 1791 The silvered dial signed JOHN ARNOLD & SON LONDON No. 18 , the hours chapter with Roman numerals within outer minutes chapter with Arabic five minute intermarkers 60-5-10-15 et seque , large subsidiary seconds dial intercepting hour and minute numerals (at VI), blued steel hands, Arnold escapement, recessed pillar screws, the top plate signed John Arnold & Son, London, No. 18/108 Invt et Fect. jewelled to the centre, and some with endstones, the pillar plate jewelled to the centre, the escape wheel jewel with endstone, the fusee with screwed in brass settings, cut bimetallic Arnold Z balance with brass cross-arm, the bimetallic sectors with tapped outer end carrying threaded heat compensation weights, undersprung gold helical balance spring having six coils the bottom coil secured to top-plate via an adjustable stud, replaced Arnold spring foot detent, the movement set in mahogany octagonal seating board (possibly replacement), the whole contained in octagonal mahogany box with inset glazed brass bezel 112 mm. dial diam., box 175 mm. max. width, 104 mm. high
A GEORGE III TWO-DAY MARINE CHRONOMETER IN OCTAGONAL MAHOGANY BOX John Arnold & Son, No. 18, circa 1791 The silvered dial signed JOHN ARNOLD & SON LONDON No. 18 , the hours chapter with Roman numerals within outer minutes chapter with Arabic five minute intermarkers 60-5-10-15 et seque , large subsidiary seconds dial intercepting hour and minute numerals (at VI), blued steel hands, Arnold escapement, recessed pillar screws, the top plate signed John Arnold & Son, London, No. 18/108 Invt et Fect. jewelled to the centre, and some with endstones, the pillar plate jewelled to the centre, the escape wheel jewel with endstone, the fusee with screwed in brass settings, cut bimetallic Arnold Z balance with brass cross-arm, the bimetallic sectors with tapped outer end carrying threaded heat compensation weights, undersprung gold helical balance spring having six coils the bottom coil secured to top-plate via an adjustable stud, replaced Arnold spring foot detent, the movement set in mahogany octagonal seating board (possibly replacement), the whole contained in octagonal mahogany box with inset glazed brass bezel 112 mm. dial diam., box 175 mm. max. width, 104 mm. high
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
