Ageron à Paris, No. 241, circa 1775. Fine 20 carat gold and enamel dumb quarterrepeating watch.

C. Double body, Louis XVi entirely engraved with wavy basket work pattern and decorated on the bezel and back with summer flowers in champleve enamel with translucent green foliage. Large rose diamond thumb pieces. D. White enamel, Roman hour and Arabic minute numerals, winding aperture at two o'clock, pierced and rose-diamond-set hands. M. Gilt brass full plate with turned pillars, fusee with chain, verge escapement with plain three-arm polished steel balance, flat balance spring, silver regulator scale. Pierced gilt brass Continental cock with polished steel end-piece. Dumb quarter-repeating with two hammers on blocks the a toc piece in the edge of the engraved dial surround activated by depressing the pendant. Signed on the dial and movement. In good condition. Diam. 44 mm.

Claude François Bailly à Morbier, circa 1770. Very fine and rare fruit wood quarter eight-day going, striking "Comtoise" weight driven long case clock.

C. Fruitwood with elaborately carved roccoco scroll work plinth on four feet mounted with chinera, the sides panelled in reserve, the front with drawers and carved in high relief with three panels, the lover with Marie Medicis paying her astrologer, on the door a group in a salon playing "trie-trac", above, a similar interior with a musical scene, further carved decoration and a horn devil mask on the shallow arched hood. D. Gilt bronze with Roman numerals and outer Arabic minute ring on enamel cartouches, white enamel centre plate. Brass pierced hands. Cast bronze fret chased with a sun, birds and scrolls. M. Three train posted frame, the going train with verge escapement. hldependent striking trains for hours and quarters. Striking on three bells. Signed below the dial. Height : 275 cm. In very good condition.

Ferdinand Berthoud No. 144, Invenit et Fecit 1753. Unique 18 ct. gold "Montre à Equation à Secondes concentriques, marquant les mois et leurs quantièmes", described in Essai sur l'horlogerie, chap. XIV, pp. 77-79, pl. XI.

C. Double body, Louis XV, chased with radiant sun-beams and further rocaille decoration, the back with a date aperture and a winding aperture with a shutter linked to a click-work in such a way that the date advances automatically each time the winding shutter is opened, by means of a small boit, to insert the key. Gilt brass protecting case latterly covered with green lizard skin. D. White enamel with Roman numerals and outer Arabic minute ring (hair lines), central revolving equation disc and aperture between "I" and "II" for the annual calendar. Gold Louis XV hands, the equation end of the minute hand set with a rosediamond set sun. Blued-steel counterpoised centre-seconds hand. M. Hinged, gilt brass full plate with baluster pillars, cylinder escapement, plain brass three-arm balance, flat balance spring, gilt brass continental cock with garnet end-stone. Signed on the dial, back plate and dial-plate. In very good condition. Diam. 45 mm.

Ferdinand Berthoud, à Paris, No. 310, bearing the Paris hallmarks for 1758-1759. Extremely fine and unique, 20 ct. gold and enamel, dumb quarter-repeating, Montre à secondes qui va huit jours sans remonter, dont le régulateur est formé par deux balanciers qui font un battement à chaque seconde, constructed on the principle, described in Ferdinand Berthoud: Essai sur l'Horlogerie, published in 1786, pages 216 to 221, plate No. XXVII, fig. 6-7-8-9 and 10, the enamel painted by Hamelin.

C. Double body, Louis XV, the bezels with enamelled floral decoration, the back with a finely painted urn of flowers signed Hamelin, (slightly restored). D. White enamel with Roman numerals, outer Arabic minute ring and subsidiary seconds. Gold Louis XV hands. M. Hinged gilt brass full plate with cylindrical pillars, fusee with chain, large brass wheel cylinder escapement with two plain polished steel balances geared together, single flat balance spring, large single gilt brass continental cock with a polished steel end-piece for each balance. Repeating on the case with a single polished steel hammer, the complete repeating mechanism (repeating work and wheel train), set between the dial and the front plate. Signed on the dial and back plate. In very good condition. Diam. 48 mm.

F. Berthoud - L'art de conduire et de régler les pendules et les montres. Paris 1759. In 8°, - Full calf binding (worn).

F. Berthoud - Essai sur l'Horlogerie. Paris 1786. 2 vol. In 4° - Full calf binding.

F. Berthoud - Traité des Horloges Marines, followed by Eclaircissement sur l'invention et la construction des Horloges Marines. Paris 1773. In 4°, - Full calf binding (worn).

F. Berthoud - Eclaircissement sur l'invention et la construction des Horloges Marines. Paris 1773. In 4°, - Full calf binding.

F. Berthoud - De la Mesure du Temps ou supplément au traité des horloges marines et à l'essai sur l' horlogerie. Paris 1787. In 4°, - Full calf binding.

F. Berthoud - Traité des Montres à Longitudes - Paris 1792, followed by Suite du Traité de Montres à Longitudes. In 4°, - Full calf binding.

F. Berthoud - Histoire de la Mesure du Temps par les Horloges. Paris An X (1802) 2 vol. In 4° - Full calf binding.

Eveux de Fleurieu Voyage fait par ordre du Roi en 1768 et 1769 à différentes parties du monde pour éprouver en nier les Horloges Marines inventées par M. Ferdinand Berthoud.

Ferdinand Berthoud No. 448, circa 1762. Very rare and fine 18 ct. gold centre-seconds stop-watch.

C. Double body, Louis XV, polished. D. White enamel with Roman numerals and outer Arabic minute ring. Gold Louis XV hands and counterpoised centre-seconds. M. Hinged gilt brass full plate with conical pillars, fusee with chain, cylinder escapement, plain brass three-arm balance, flat balance spring, gilt brass continental cock with polished steel end-piece. The balance can be stopped at will by means of a small slide on the border of the dial. Signed on the dial and back plate. In very good condition. Diam. 48 mm.

Ferdinand Berthoud à Paris, No. 933, with Paris hallmarks for 1777. Very fine and rare 18 ct. two coloured gold dumb quarter-repeating centre-seconds stop-watch.

C. Double body, Louis XVI, the bezel with yellow gold cast entrelac decoration, the engine-turned back centred with the monogram "F.C.". D. White enamel with Roman numerals and outer Arabic minute and seconds ring. Gold Louis XV hands. M. Hinged gilt brass full plate with cylindrical pillars, fusee with chain, cylinder escapement, plain brass three-arm balance, flat balance spring, gilt brass continental cock with polished steel end-piece. A small lever on the dial-plate to stop the balance. Repeating on the case by depressing the pendant. Signed on the dial, back and dialplate. In very good condition. Diam. 44 mm.

Ferdinand Berthoud à Paris, circa 1770. Very fine and rare, month-going rose wood marquetry, weight-driven longcase regulator with equation of time.

C. Rectangular with glazed door, gilt bronze ' pearl' decoration, applied five-pointed star on the base,with flambeau urn finial. D. White enamel by Coteau with Roman numerals, outer Arabic minute ring, gold paillonne five minute divisions, aperture below "XII" for the annual calendar. Pierced and engraved gilt brass hands with blued-steel centre- seconds and mean time minute hand. M. Rectangular brass with cylindrical pillars, weight- driven with Huygens endless rope winding, Graham dead beat escapement, seconds beating pendulum with knife-edge suspension and Ferdinand Berthoud's special compensation with offset bob. The annual calendar ring with the equation cam, behind the dial. Signed on the dial and the back plate. In very good condition. Dim. 230 x 50 x 28 cm.

Ferdinand Berthoud, Montre Astronomique No. 3, constructed for him by his pupil and unique collaborator Jean Martin in 1806, following the model of that No. 73, invented by Ferdinand Berthoud in 1775, but at a reduced scale. Extremely fine and unique silver Astronomical watch with centre-seconds and balance amplitude indication, made for M. Chaptal, the celebrated physician and politician .

C. Four body, Empire with reeded band by Tavernier (Master mark), No. 2591, the polished back engraved with the crest of Jean Antoine Claude Chaptal, Comte de Chanteloup. Silver cuvette. D. Small eccentric silver chapter with Roman numerals and outer Arabic minute ring, silver Arabic seconds chapter ring on the border of the bezel. Frosted and gilt dial plate with grazed aperture for the balance amplitude indication, engraved: " Montre Astronomique No. 3, Ferdinand Berthoud Invenit 1775, Réduite et Exécutée par Jean Martin An 1806". blued-steel Breguet hands with skeletonised tips. M. Gilt brass 22"', fully jewelled including the fusee with maintaining power, early form of pivoted detent with jewelled pallets and impulse pin. Unusual and complex four arm-compensation balance with gold nut poising weights and timing screws, diamond end-stone, free sprung blued-steel balance spring. Signed on the dial plate. In very good condition. Diam. 59 mm.

Jean Martin, Elève de Ferdinand Berthoud, No. 85, made in 1808. Very rare and fine silver and gold pocket chronometer, gimbaled in original mahogany box.

C. Four body, Empire, by Tavernier (master mark) No. 2198, with reeded band, gold bow and hinges, a later gold monogram "E.S.M." applied on the polished back. Silver cuvette with a later engraving. Double body mahogany box, the gimbals cvith velvet lined bowl, to mount the chronometer for use at sea. D. Frosted and gilt with Roman numerals on a silver polished chapter ring and subsidiary seconds. Blued-steel Breguet hands. M. Gilt brass full plate with cylindrical pillars, fusee with maintaining power, pivoted detent escapement of the type designed by Louis Berthoud, cut bimetallic three-arm balance, bluedsteel flat balance spring. Signed on the dial and back plate. In very good condition. Diam. 61 mm.

Louis Berthoud No. 52, Montre Marine à suspension, boîte d'argent, sold to the Marine Department in Floréal an IX ( May 1801). Extremely rare and important silver historical marine chronometer, presented by the Premier Consul (Napoléon Bonaparte) to the Duc of Decres, on 11 Ventôse an 9 (2 March 1802) and by Decres to the Capitaine de Frégate Ponée in Marsh 1812, subsequently it was lent for a year to Jerôme Bonaparte, King of Westphalia. to be continuel

C. Three piece, "en forme de tabatière", engineturned, by Joly (Master mark), with a dedication engraved on the inner dome : "Donné par le Premier Consul au Contre Amiral Decrès, en récompense du combat glorieux qu'il a soutenu avec le vaisseau Le Guillaume Tell, contre des forces anglaises supérieures (Arreté du 11 Ventôse an 9), the back cover engraved with another dedication : Donnée par le Duc Decrès, Ministre de la Marine, au Capitaine de Frégate Poilée, en souvenir de sa belle conduite à bord de la Frégate La Néréide, pendant la Campagne de 1811. Mars 1812. Double body mahogany box with glazed circular observation aperture on the lid. Brass gimballed suspension with leadweighted bowl lined with green velvet. D. White enamel regulator type with a small eccentric Roman chapter for hours, subsidiary seconds below, outer Arabic minute ring on the border of the bezel. Blued-steel Breguet hands. M. Frosted and gilt full plate, with conical pillars secured by blued-steel nuts with polished steel washers, fusee and chain with maintaining power, counterpoised straight line lever escapement with rollers on the balance staff. three-armed compensation balance with three weights,and three additional weights and platinum timing screws. Free-sprung blued-steel conical spring with adjustable collar. Signed on the back plate and the dial rim : "Par Ls. Berthoud No. 52" and on the dial : "Ls.Berthoud No. 52". In very good condition with original ratchet key. Diam. 65 mm. Dim. 123 x 123 x 74 mm.

Louis Berthoud No. 2461 - 53, sold to M. le Général Cafarelli, Prefet Maritime de Brest, on 16 Messidor year XI (5 July 1803) for 70 Louis. Early silver pocket chronometer.

C. Three body massive "à double fond" with fixed cuvette and concealed hinges, polished, polished, typical of Louis Berthoud's pocket "montres marines", made by Joly (Master mark). D. White enamel with Roman numerals and subsidiary seconds made by Lucard (signed on the enamel backing); blued-steel Breguet hands. M. Frosted and gilt full plate with brass cylindrical pillars secured by pins, fusee with chain, maintaining power, typical Loius Berthoud's pivoted detent escapement and three-arm compensation balance conical balance spring. Signed on the dial, dial plate and back plate. In very good condition in a three body mahogany deck watch box with brass fittings. Diam. 68 mm.

Berthoud Frères, No. 216, circa 1818. Rare and important marine chronometer, made in Louis Berthoud's workshop, after his death.

C. Double body mahogany box. Brass gimbal with a lead-weighted brass bowl lined with velvet. Brass case en roma' de tabatière, mounted in the gimballed bowl with a screwed glazed cover. D. Silvered regulator type, with small Roman chapter for hours, subsidiary seconds below, outer Arabic minute ring on the border of the bezel and small 24 hour up-and-down sector at "10". Bluedsteel Breguet hands. M. Brass full plate,delicate sun-burst pattern stone finished, with steel conical pillars secured by ruts with washers. Fusee with chain, maintaining power, fully jewelled, pivoted detent escapement, two-arm compensation balance, with poising and timing screws, bluedsteel helical balance spring with terminal curves. Signed on the dial and the back plate. In very good condition. Dial diam. 80 mm. Dim. 150 x 150 x 150 mm.