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287-4221 Marine chronometer/expedition chronometer: significant, small Berthoud chronometer No. 77, ca. 1801
Mahogany box with bone plate No. 77, ca. 12 x 10 x 7 cm, 3-piece, central section with round recess for the original silver case with brass setting, French silver hallmarks, case maker’s mark PP, silver hallmark Paris 1798–1809, Paris city hallmark from 1797, also so-called Paris guarantee hallmark 1798–1809, Case back with winding aperture, exquisite, signed Louis Berthoud chronometer movement, matching number No. 77, experimental, exceptionally large chronometer balance, conical hairspring, diamond endstone, spring detent escapement, movement setting also signed Louis Berthoud and numbered No. 77, original enamel ‘Regulator’ dial, Breguet steel hands, also signed and numbered No. 77, in working order. In his notes from 1801, Louis Berthoud wrote that he was now beginning to manufacture his second series of seven marine chronometers, starting with No. 74 and ending with No. 80. Compared to the first series from 1800, there were to be qualitative changes that allowed more space for the escapement unit and the large chronometer balance. The first series also consisted of 7 chronometers. This is therefore one of the first 14 marine chronometers/expedition chronometers by Louis Berthoud. Louis Berthoud produced ca. 150 chronometers, worked as a watchmaker for the observatory and the navy, and was a member of the ‘Bureau des Longitudes’. After his death, Breguet took over the post of ‘Horloger de la Marine’. A chronometer from the first series, No. 52, was auctioned in 2025 for a record price of over 400,000 Swiss francs (https://www.cortrie.de/go/Pq1).
Hammerprice: 65.000 €
plus charge
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