Breguet. An extremely important and unique 18K gold openface perpetual calendar keywound lever watch with phases of the moon and equation of time
Breguet. An extremely important and unique 18K gold openface perpetual calendar keywound lever watch with phases of the moon and equation of time

SIGNED BREGUET, NO. 3862, STARTED BETWEEN 1821 AND 1824, FINISHED BETWEEN 1965 AND 1968 AND SOLD TO DOCTEUR HALPERN ON 25 OCTOBER 1968 FOR 70,000 FRANCS

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Breguet. An extremely important and unique 18K gold openface perpetual calendar keywound lever watch with phases of the moon and equation of time
Signed Breguet, No. 3862, started between 1821 and 1824, finished between 1965 and 1968 and sold to Docteur Halpern on 25 October 1968 for 70,000 Francs
The gilt-finished movement with straight line lever escapement, 21 jewels, bimetallic compensation balance with straight parachutes on both pivots, spiral steel spring with final curve, steel regulator with gold index, gold cuvette, the silvered engine-turned dial with two small dials indicating solar and mean time, the solar time to the left with Arabic numerals, an applied gold sun symbol above 12 o'clock, the mean time to the right with Roman numerals, an applied gold star symbol above 12 o'clock, outer silvered ring calibrated for the annual calendar with central blued steel serpentine hand, small subsidiary seconds dial, window for the day of the week indicated by the first letter, fan-shaped aperture for phases of the moon combined with lunar calendar, in engine-turned case, case numbered, cuvette signed and numbered, dial signed
61 mm. diam.

Lot Essay

Accompanied by Breguet original fitted presentation box numbered 3862, two metal pins for setting the hands and a gold ratchet key.

The indication of the equation of time was of particular importance for astronomers and navigators and a subject of considerable interest to the important watchmakers. It is thought that the first one to work it out was John Flamsteed who around 1670 tabulated the difference between noon mean time and true solar noon. These tables were used to check a watch against a sundial.

Some hundred years later, Abraham-Louis Breguet, universally recognized as the greatest watchmaker of all times, started the development of the most sophisticated watches with equation of time of the era.

The present watch is particularly interesting as its movement was made as early as between 1821 to 1824 but was finished only from 1965 to 1968 when dial, moon disc, hands and case were added. It was finally sold on 25 October 1968 to Docteur Halpern for the price of 70,000 Francs.

A similar watch bearing the consecutive serial number 3863 and with the additional complication of a "à tact" hand is illustrated in The Art of Breguet by George Daniels, p. 261, pl. 304a-d.

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