A FRENCH SILVER-CASED POCKET CHRONOMETER Brosse, No. 13, circa 1825 The white enamel regulator dial signed BROSSE with combined hour and minutes chapters with Roman numerals (at III), subsidiary seconds with Arabic numerals (at IX), blued steel hands, gilt half-plate pinned movement (52 mm. diam.), the top plate inscribed Brosse No. 13 , the pillar plate with ebauche maker's punch P.M. and numbered 7391 , going barrel, Earnshaw escapement, large diameter (25 mm.) three-armed solid rim brass balance, grey steel flat balance spring, the index arm with bimetallic compensation curb assembly, spring foot detent with steel locking pallet and steel discharging pin protruding down from the balance collet, escape wheel of sixteen teeth and on the same arbor a separate wheel with eight finger-shaped teeth engaging with a separate seconds wheel having sixty saw teeth controlled by a jump spring, and having a stop/start assembly operated via a slide in the band, silver case with engine-turned back and gilt-brass cuvette signed and numbered Brosse No. 13 , casemaker's mark for Dupré , assay marks indicating circa 1825 53 mm. dial diam.
A FRENCH SILVER-CASED POCKET CHRONOMETER Brosse, No. 13, circa 1825 The white enamel regulator dial signed BROSSE with combined hour and minutes chapters with Roman numerals (at III), subsidiary seconds with Arabic numerals (at IX), blued steel hands, gilt half-plate pinned movement (52 mm. diam.), the top plate inscribed Brosse No. 13 , the pillar plate with ebauche maker's punch P.M. and numbered 7391 , going barrel, Earnshaw escapement, large diameter (25 mm.) three-armed solid rim brass balance, grey steel flat balance spring, the index arm with bimetallic compensation curb assembly, spring foot detent with steel locking pallet and steel discharging pin protruding down from the balance collet, escape wheel of sixteen teeth and on the same arbor a separate wheel with eight finger-shaped teeth engaging with a separate seconds wheel having sixty saw teeth controlled by a jump spring, and having a stop/start assembly operated via a slide in the band, silver case with engine-turned back and gilt-brass cuvette signed and numbered Brosse No. 13 , casemaker's mark for Dupré , assay marks indicating circa 1825 53 mm. dial diam.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
