A French mahogany two-day marine chronometer Auguste Berthoud, No. 170, circa 1850 The frosted silvered dial signed Auguste Berthoud No. 170 , Roman hour numerals, Breguet hour and minute hands, subsidiary seconds dial intercepting XII, blued steel hands, reversed fusee, Earnshaw escapement, Berthoud three-arm cut bimetallic balance each with rectangular heat compensation weights, blued steel helical balance spring without terminal curves, spring foot detent with jewelled locking stone, brass bowl, gimbal with bolt action locking arm, two-tier plain mahogany Continental style box with sliding cover to top viewing port 70 mm. dial diam., 145 mm. sq. box
A French mahogany two-day marine chronometer Auguste Berthoud, No. 170, circa 1850 The frosted silvered dial signed Auguste Berthoud No. 170 , Roman hour numerals, Breguet hour and minute hands, subsidiary seconds dial intercepting XII, blued steel hands, reversed fusee, Earnshaw escapement, Berthoud three-arm cut bimetallic balance each with rectangular heat compensation weights, blued steel helical balance spring without terminal curves, spring foot detent with jewelled locking stone, brass bowl, gimbal with bolt action locking arm, two-tier plain mahogany Continental style box with sliding cover to top viewing port 70 mm. dial diam., 145 mm. sq. box
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
