The Collection of a European Nobleman

Geneva, May 11, 2008

LOT 138

Bi-Retrograde Perpetual Calendar Bulletin d'Observatoire Roger Dubuis, Horloger Genèvois, "Bi-Retrograde Perpetual Calendar Chronometer", No. 05/28, movement No. 263, Ref. HO43 5772 0 3R.73. Made in a limited edition of 28 pieces, sold on January 26, 2006. Very fine and rare, large, center-seconds, self-winding, waterresistant, 18K white gold "Bulletin d'Observatoire" chronometer wristwatch with bi-retrograde perpetual calendar, moon phases and an 18K white gold Roger Dubuis deployant clasp. Accompanied by the certificate of origin, chronometer certificate and setting pin.

C. Three-body, solid, polished and brushed, transparent case back with 8 screws, correctors on the band, concave bezel, large curved lugs, sapphire crystals. D. Matte silver with polished black-edged silver radial Roman numerals, outer minute and seconds track with Arabic five-minute/seconds numerals, subsidiary dials at 12 for the months and the leap-year indication, aperture at 6 for the moon phase, on the sides, sectors for the retrograde days of the week and of the month. White gold feuille hour and minute hands, blued steel subsidiary hands. M. Cal. 5772, stamped with the Seal of Geneva Quality Mark, rhodium-plated, fausses cotes and oeilde- perdrix decoration, 25 jewels, straight line lever escapement, monometallic balance adjusted to 5 positions, shock absorber, self-compensating flat balance spring, swan neck micrometer regulator. Dial, case and movement signed. Dim. 44 mm. Thickness 13.5 mm.