A French mahogany two-day marine chronometer Louis Berthoud, No 103; Circa 1810 The white enamel dial of regulator format signed Louis Berthoud Horger de la Marine , numbered within the subsidiary second dial No. 103, the hours dial (at XII) with Roman hour numerals, outer minutes dial with Arabic five-minute intermarkers 60-5-10 et seque , blued steel hands, the hour and minute being of Breguet format, the frames with radial stoned grain finish, the top-plate inscribed Louis Berthoud No 103 , grained finish steel pillars their lower half of conical shape and with square-head polished steel securing nuts, 18,000 quick train, Earnshaw escapement, three-armed cut bimetallic balance each sector carrying a segmental heat compensation weight each with two large brass and one small steel peripheral screws, blued steel helical balance spring without terminal curves all beneath supporting balance bridge with separate top pivot cock, Berthoud pivoted detent with polished steel locking pallet, the movement held within a brass drum with friction bezel inscribed DEPOT GRAL DE LA MARINE , convex glass, the whole in gimballed green velvet-lined counter-weighted brass bowl, two-tier mahogany box, the top with sliding cover above the viewing port with recessed diamond shape plaque inscribed No 103 BIS. 80 mm. dial diam., 140 x 140 x 120 mm. box
A French mahogany two-day marine chronometer Louis Berthoud, No 103; Circa 1810 The white enamel dial of regulator format signed Louis Berthoud Horger de la Marine , numbered within the subsidiary second dial No. 103, the hours dial (at XII) with Roman hour numerals, outer minutes dial with Arabic five-minute intermarkers 60-5-10 et seque , blued steel hands, the hour and minute being of Breguet format, the frames with radial stoned grain finish, the top-plate inscribed Louis Berthoud No 103 , grained finish steel pillars their lower half of conical shape and with square-head polished steel securing nuts, 18,000 quick train, Earnshaw escapement, three-armed cut bimetallic balance each sector carrying a segmental heat compensation weight each with two large brass and one small steel peripheral screws, blued steel helical balance spring without terminal curves all beneath supporting balance bridge with separate top pivot cock, Berthoud pivoted detent with polished steel locking pallet, the movement held within a brass drum with friction bezel inscribed DEPOT GRAL DE LA MARINE , convex glass, the whole in gimballed green velvet-lined counter-weighted brass bowl, two-tier mahogany box, the top with sliding cover above the viewing port with recessed diamond shape plaque inscribed No 103 BIS. 80 mm. dial diam., 140 x 140 x 120 mm. box
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
