Paul Ditisheim, La Chaux-de-Fonds, (Swiss),No. 18276, Grand Prix Exposition Universelle,Paris 1900 - Premier aux Concours Chronométriquesdes Observatoires de Kew, Washington & Neuchâtel,circa 1910.Fine silver keyless lever chronometer in original mahogany fitted box.

C. Three body, massive, with brass fixings and corners. Silver four body, massive, "bassine et filets", polished. Hinged silver cuvette. D. Frosted silver with Roman numerals and subsidiary seconds. Blued steel "spade" hands. M. 22''', gilt brass, 20 jewels, straight line lever escapement, brass-invar Guillaume balance, Breguet balance spring.Signed on the dial and movement.Diam. 60 mm.

Paul Ditisheim, Sovil, No. 734352, Swiss, circa 1920.Fine 18K gold, keyless watch with special compensated balance.

C. Four body, "demi-bassine", polished. Hinged gold cuvette engraved with the awarded prizes at the Exhibitions of Paris in 1900 and Berne in 1914.D. White enamel with bolt Breguet numerals and sunk subsidiary seconds. Blued steel "modern" hands. M. 18''', rhodium plated, 18 jewels, straight line lever escapement, Affix balance, Swiss patent No. 91169, Breguet balance spring with rack and pinion micrometric index.Signed on the dial, case and movement.Accompanied by photocopies of the Ditisheim patents No. 91169 and 98234, concerning the invention of the Affix balance.Diam. 49 mm.

Breguet No. 4107, produced in September 1938, sold to the French Aéronautique on December 30, 1938, for 15800 Francs.Fine keyless Sidéromètre Breguet Type 101 split seconds chronograph, Breveté S.G.D.G., from a small series of 25 pieces only.

C. Painted aluminium box, lined with felt insulation. Three fixing brackets are riveted to the outside. There is no case, the movement being fixed to the underside of the dial-plate, the latter engraved with operating indication. D. White enamel with outer seconds ring and three apertures for the digital degree indications. Blued steel counterpoised hand. M. 24''', high quality, blank by V. Piguet, 21 jewels, two with differential winding, one for the going train, the other for the motion work sthat the going train can advance the numbered discs with minimal resistance. The motion work is very complex and carefully made. Straight line lever escapement, brass-invar "Intégral" Guillaume balance, blued steel balance spring with terminal curve.Signed on the dial, the front plate and on the reverse of the bezel.Dim. 100 x 143 x 118 mm

L. Leroy & Cie., 7 Bd. de La Madeleine, Paris,No. 1403, Pendule à pression constante commissioned on January 27th 1930, delivered on December 2, the same year.Very fine and rare, centre seconds, Constant Pressure observatory precision regulator.

C. White painted bronze cylinder with cast-iron white painted wall bracket, glass dome over the brass bracket supporting the movement. D. Silvered with Arabic seconds ring and observation apertures over the remontoire and the escape wheel. Blued steel counterpoised hand. M. Brass trapezoidal full plate, marble finished, with cylindrical pillars, running in partial vacuum. Reid type escapement specially adapted by Leroy, the power supplied by the fall of a weighted arm, raised every 32 seconds byan electro-magnet. The invar pendulum beats 61 times in 60 seconds. A double contact is activated directly by the pendulum, and both circuits are closed momentarily with each oscillation, except on the 61st swing when they are by-passed by the action of a third breaker in order to mark the minute. By adjusting the internal pressure of the case, the rate can be adjusted, starting at 0 atmospheres. An increase of pressure of 1 mm of mercury, slows the rate by 0,018 of a second. The rateis adjusted so that the signals coincide with the hour precisely, once the small daily variations have been eliminated.Dim. 146 x 38 cm.

L. Leroy & Cie., Paris, Chronostat No. 1, circa 1955.Very fine mahogany prototype of the Chronostat.

C. Three body deck-watch type mahogany box. Cylindrical brass bowl with screwed bezel. D. Silvered with Arabic numerals and subsidiary seconds. Blued steel "spade" hands. M. Brass, marble finished, electrically powered, Sully type "shaft cutting" frictional rest escapement with vertical escape wheel and double pallet on the balance staff, "Integral" Guillaume balance, free sprung blued steel helical balance spring with terminal curves.Signed on the dial.Dial diam. 70 mm.

L. Leroy & Cie., Paris, Chronostat No. 2, circa 1955.Very fine mahogany prototype of the Chronostat.

C. Double body mahogany box. Cylindrical nickel bowl with screwed bezel. D. Silvered with Arabic numerals and subsidiary seconds. Blued steel "spade" hands. M. Electrically powered, spring detent escapement, "Integral" Guillaume balance, free sprung blued steel helical balance spring with terminal curves.Signed on the dial and movement.Dial diam. 70 mm.

L. Leroy & Cie., Paris, No. 1898, ATO Patent, sold to the French Navy following the contest organised at the Observatory from February 2, 1969, to April 14, 1969, accompanied by the original rating book attestingit was delivered to the submarine Psyché onAugust 12, 1969.Fine mahogany Chronostat III, in original fitted travelling box.

C. Double body mahogany, rectangular with glazed lid. D. Silvered with Arabic numerals and subsidiary seconds. Blued steel "dauphines" hands. M. Transistor controlled electrically impulse, chronometer pattern Guillaume balance, free sprung blued steel helical balance spring.Signed on the dial and the movement.Dim. 17 x 13 x 9 cm.

L. Leroy & Cie., Horlogers de la Marine, 4, Faubourg Saint Honoré, Paris, No. 1846, Brillé Patent, sold in 1959 for 1500 Francs, to the Service Hydrographique de la Marine.Fine Base de temps électromagnétique type "Chronostat II", in original fitted box.

C. Square glazed amagnetic painted metal case.M. Transistor controlled electrically impulsed, chronometer pattern Guillaume balance, free sprung blued steel helical balance spring.Signed on the movement.Dim. 68 x 68 x 40 mm.

L. Leroy & Cie., Horlogers de la Marine,7 Boulevard de la Madeleine, Paris, No. 2931, sold to Marquise de Flers in 1914.Fine 18K gold keyless pocket lever chronometer. Bulletin de Première classe de l'Observatoire National de Besançon No. 9234, in 1913, was awarded the Gold Medal with a total of 236 marks, in original fitted leather box.

C. Three body, massive, "bassine", polished. Hinged gold cuvette engraved with the awarded prize. D. Two tone white enamel, with Roman numerals, outer minute ring and sunk subsidiary seconds. Blued steel "spade" hands. M. 19''', gilt brass with punch-mark in form of a viper's head set by the Observatory of Besançon, 20 jewels, straight line lever escapement, brass-invar Guillaume balance adjusted by Grogg, blued steel balance spring with terminal curve.Signed on the dial, case and movement.Accompanied by copies of the timing certificates and by a letter from Maison Leroy.Diam. 53 mm.

J. Auricoste, Horloger de la Marine, 10, rue la Boetie à Paris, circa 1910.Fine and unusual small sidereal counter.

C. Three body mahogany deck-watch type box. Brass bowl with screwed bezel. D. White enamel, outer Arabic sidereal seconds ring and subsidiary small60 sidereal minute register. Blued steel hands.M. 20''', brass, three quarter plate, 15 jewels, with cylindrical pillars, going barrel, pivoted detent escapement, cut bimetallic balance, blued steel balance spring with terminal curve.Signed on the wooden box.Dial diam. 50 mm.

Elgin National Watch Co., No. 15394104, made for the U.S. Navy, Service Number 4104, circa 1940.Fine silver keyless pocket lever chronometer, with40 hour power reserve indication, in original fitted double body mahogany deck box.

C. Four body, massive, "bassine", polished, the back engraved with the Service Number. Hinged silver cuvette. D. Silvered with Arabic numerals, outer minute ring, sunk subsidiary seconds and Up-and-Down scale. Blued steel "spade" hands. M. 19''', rhodium plated "fausses côtes" decoration in a sunburst pattern, 21 jewels, straight line lever escapement, brass-invar Guillaume balance adjusted in 5 positions, Breguet balance spring.Signed on the dial and movement.Diam. 63 mm.

A. Lange & Söhne, Glashütte, i. Sa., No. 201 378,circa 1940.Fine silver keyless pocket lever chronometer with32 hour power reserve indication, made for the German Navy, Service Number M. 6884.

C. Four body, massive, "bassine", polished, the back engraved with the Service Number. Hinged silver cuvette. D. Silvered two tone with Arabic numerals, subsidiary seconds and Up-and-Down scale. Blued steel "spade" hands. M. 22''', frosted and gilt, three quarter plate, calibre 48, 17 jewels, straight line lever escapement, brass-invar Guillaume balance, Breguet balance spring.Signed on the case and movement.Diam. 59 mm.

George Daniels, London, No. SB, specially made for Mr. Sam Bloomfield in 1969.Very elegant and unique 18K gold pocket chronometer with twin barrel, chronometer escapement, one minute tourbillon regulator and retrograde jumping hours. In original red Morocco fitted box with gold male key, short tapered link gold chain and certificate.

C. Double body with engine-turned back, marked"G. D." (George Daniels) with London hallmarks for 1969 and articulated crescent pendant drawn from that of Sylvain Mairet. D. Silver engine turned with eccentric minute ring, retrograde hour sector, and subsidiary seconds. Blued steel hands. M. Glazed, 25''', frosted and gilt, with tween barrels, spring detent escapement, four-arm mono-metallic balance with adjusting screw at each ends, based on the same principle as the giromax used by Patek Philippe, free sprung self compensating balance sping with terminal curve. Two-arm polished steel carriage with narrow straight lined bridge in the style of Nicole Nielsen first type.Signed on the dial and movement.Diam. 62 mm.

Omega, Swiss, De Ville Co-Axial, completed in 1999. Prototype No. 01 of three limited series of delux timepieces: A series of 1000 watches in yellow gold with silver dial.-A series of 1000 watches in red gold with midnight blue dial.-A series of 100 watches in platinum with copper coloured dial.Very fine and unique 18K pink gold Amagnetic, centre seconds, self-winding wristwatch with date, Omega Calibre 2500 with George Daniels Coaxial Escapement and Regulating System.Chronometer certification by the C.O.S.C. (Contrôle Officiel de Chronométrie Suisse)

C. Massive, polished with screwed back and protected winding crown. Antimagnetic dust cap. Scratch-resistant sapphire crystal with anti-reflective treatment inside. D. Black, 12 facets applied with heavily profiled polished gold Roman numerals and indexes, outer minute and seconds ring, date aperture onchapter III. Skeleton luminescent, faceted leaf-shaped, diamond-polished hands. M. 11''', rhodium plated, "fausses côtes" decoration, 27 jewels, the steel rotor type winding weight pivoted to the centre. Daniels Coaxial escapement, four-arm Omega monometallic balance with two regulating micro screws on the rim, adjusted to five positions and temperatures, the balance pivots, both with Incabloc suspensions, free sprung Invar balance spring.Signed on the dial, case and movement.Accompanied by alligator leather strap and 18K pink gold Omega deployant clasp, in a luxurious pigskin box designed as a book with ribbed back.Diam.38 mm.

F. P. Journe Invenit et Fecit, Resonance System Chronometer, Prototype No. 000, completed in September 1999 for the Antiquorum Theme Auction: The Longitude at the Eve of the Third Millennium.Fine platinum, two time zone, world first wristwatch with resonance controlled twin independent movements and 40 hour power reserve indication.

C. Massive, polished, the back with sapphire crystal, top and side winding crowns engine-turned in a silk-like pattern. D. Twin silver engine-turned with concentric radial Arabic hour and minute rings, offset subsidiary seconds. Frosted gold dial plate with engraved Up-and-Down scale. Blued steel "Journe" hands. M. 13''' rhodium plated, "fausses côtes" decoration, twin independent complete trains set on a single plate, 37 jewels, straight line levers escapements, berylium four-arm balances withour adjustable timing weights, free sprung Invar balance spring, the balance pivots, both with incabloc suspensions. One of the escapements is mounted on a small platform pivoting around the second wheel by means of rack and pinion to adjust the distance between the two balances in order to find the most efficient position for resonance synchronisation.Signed on the dial and movement.Diam. 38 mm.

Breguet, Ref. 3800, Aéronavale Type XX, 1990's.Fine, self-winding, water-resistant down to 100 m., stainless steel military-type wristwatch with retouren vol round button chronograph and registers, stainless steel integrated bracelet.

C. three body, polished, revolving graduated bezel, reeded band, screwed case back. D. black with tritium-coated Arabic numerals, auxiliary dials for the seconds, the 12 hours and 30 minutes registers. "Bâton" tritium-coated hands. M. mechanical with automatic winding, 25 jewels, shock-absorber.Dial, case and movement signed.Diam. 39 mm.

Gérald Genta, Double Rétro Classic, Ref. G 3734,circa 1998.Very fine and rare, jumping-hour, self-winding, water-resistant, 18K pink gold gentleman's wristwatch with retrograde minutes and date, with leather strap and 18K pink gold Gérald Genta buckle.

C. three body, massive, polished, back with screws, reeded band, rounded bezel, straight lugs, screwed bars. D. "guilloché" mother-of-pearl with painted Arabic numerals, at the top, sector for the retrograde minutes, at the bottom, other sector of 150 degrees for the date, on the 12, aperture for the hours. "Epée" blued steel hands. M. mechanical with automatic winding.Dial, case and movement signed.Diam. 36 mm.

Girard-Perregaux, Chronographe Rattrapante Tribute to Ferrari, No. 206, Ref. 9015, made in 1994.Very fine and rare, self-winding, water-resistant to3 atm., 18K yellow gold gentleman's wristwatch with round button split second chronograph and registers, three crowns, 40 hours autonomy, leather strap and 18K yellow gold Ferrari buckle.

C. three body, massive, polished, screwed dedicated case back, on the winding-crown, the logo "Ferrari". D. matt silver with applied gold indexes, auxiliary dials for the seconds, the 12 hours and 30 minutes registers, under the 12 the logo "Ferrari". "Dauphine" yellow gold hands. M. Cal. 8290, mechanical with automatic winding, 27 jewels.Dial, case and movement signed.Diam. 38 mm.

Corum, Tabogan, 1990's.Fine and unusual, water-resistant, asymmetric, rectangular curved, 18K pink gold gentleman's wristwatch bearing a sliding and hinged mechanism which transforms the watch into a bed-side clock, with leather strap and 18K pink gold Corum buckle.

C. four body, massive, polished, asymmetric, wide outer bezel and case back with screws both with hinges, the opening mechanism of the case operated by two pushers at the bottom, inner case back bearing the engraving of the GMT time-zones of 14 towns in the world, according to GMT noon in London, curved sapphire crystal, hooded winding-crown. D. in meteorite "Agpalilik", embossed with stilized Roman numerals and tritium-coated indexes. "Bâton" tritium-coated gold hands. M. mechanical with manualwinding.Signed on the dial, numbered on the case.Dim. 24 x 40 mm.

Officine Panerai Firenze 1860, Radiomir, No 8/60, made on 18 December, 1997, sold on 4 March, 1998.Large and extremely rare, cushion shaped, waterproof to 30 meters, platinum military-type diving wristwatch with 41 hours power-reserve, 18K white gold buckle. Accompanied by a large thuya-root wooden fitted box, a maquette of the Mignatta explosive mobile torpedo, the book I Mezzi d'Assalto della Xa Flottiglia Mas di Marco Spertini e Erminio Bagnasco and a certificate.

C. three body, massive (weighing 124 gr. without the movement), polished, screwed mineral sapphire crystal back (with an additional platinum back), screwed crown, wire lugs. D. black with tritium-coated Arabic numerals and indexes. "Bâton" tritium-coated hands. M. 16''' signed Rolex and dating of the 1940's original movement, rhodium plated, "fausses côtes" decoration, 17 jewels, lever escapement, monometallic balance with 18'000 oscillations per hour, shock-absorber, self-compensating flat balace-spring.Dial, case and movement signed.Dim. 46 x 50 mm.