Important Modern and Vintage Timepieces

Hog Kong, Feb 26, 2011

LOT 437

Roger Dubuis 18KPG Sympathie Bi-Retrograde Perpetual Calendar Chronograph Roger Dubuis, Horloger Genèvois, "Sympathie ? Bi-Retrograde Perpetual Calendar Chronograph Chronometer", No. 17/28, movement No. 81, case No. 197988, Ref. S37 5637 5. Made in a limited edition of 28 examples, sold on October 19th, 1999. Very fine and rare, "carré lobé", water-resistant, 18K pink gold "Bulletin d'Observatoire" chronometer wristwatch with square button chronograph, register, bi-retrograde perpetual calendar, moon phases and an 18K pink gold Roger Dubuis deployant clasp. Accompanied by a fitted box, certificate of origin, COSC certificate, additional solid case back and setting pin.

C. Three-body, solid, polished and brushed, transparent case back with 8 screws and etched crystal, correctors on the band, lapidated bezel, curved lugs with screw bars, sapphire crystals. D. Two-tone black with applied pink gold pyramidal indexes, outer fifths of a second and minute track, subsidiary dials at 12 for the months and the leap years, at 9 for the seconds and 3 for the 30-minute register, on the sides, sectors for the retrograde days of the week and of the month, aperture for the moon phases. Pink gold alpha hands. M. Cal. RD 5637, stamped with the Seal of Geneva Quality Mark, rhodium-plated, fausses cotes decoration, 21 jewels, and straight line lever escapement, monometallic balance adjusted to 5 positions, shock absorber, self-compensating Breguet balance spring, and swan neck micrometer regulator. Dial and movement signed, case hallmarked and numbered. Dim. 38 x 38 mm. Thickness 12 mm.