The Collection of a European Nobleman

Geneva, May 11, 2008

LOT 102

Biretrographe Perpetual Calendar Roger Dubuis, Horloger Genèvois, "Biretrographe Perpetual Calendar Chronometer", No. 11/28, movement No. 173, Ref. SY43 5610 0. Made in a limited edition of 28 pieces, sold on September 2, 2005. Very fine, rare and complicated, "carré lobé", 18K white gold chronometer wristwatch with round button chronograph, register, biretrograde perpetual calendar, week of the year indication, moon phase, leap-year indication and an 18K white gold 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 and between the lugs, stepped bezel with faceted decoration, large curved lugs, screwed bars, sapphire crystals. D. Satine silver with applied polished white gold baton indexes, inner minute track, outer fifths of a second divisions and outermost ring for the weeks of the year indication numbered from 1-52, subsidiary dials at 6 for the months with aperture for the leap-year indication, at 3 for the 30-minute register, at 9 for the seconds, aperture at 12 for the moon phases, on the sides, sectors for the retrograde days of the week and date. White gold skeleton feuille hour and minute hands, blued steel cathedrale sector hands. M. Cal. RD5610, stamped with the Seal of Geneva Quality Mark, rhodium-plated, fausses cotes and oeil-de-perdrix decoration, 21 jewels, straight line lever escapement, monometallic balance adjusted to 5 positions, shock absorber, self-compensating Breguet balance spring, swan neck micrometer regulator. Dial, case and movement signed. Dim. 44 mm. Thickness 16 mm.