Important Collectors’ Wristwatches, P...

New York - The Fuller Building, Mar 28, 2007

LOT 321

"Biretrograde Perpetual Calendar Chronograph" Roger Dubuis, Genève, "Biretrograde Perpetual Calendar Chronograph", No. 33. Made circa 2000. Very fine, astronomic, 18K pink gold "Bulletin d'Observatoire" gentleman's wristwatch with biretrograde calendar, perpetual and lunar calendar, moon phases, round button chronograph, register and an 18K pink gold Roger Dubuis deployant clasp.

C. Three-body, solid, polished and brushed, transparent screwed-down case back, back crystal with volutes, concave bezel and lugs, sapphire crystals. D. Black with applied pink gold dot indexes, subsidiary seconds and 30-minute register dials, dial for the months and the leap years at 12, on each side, sectors for the retrograde days of the week and of the month, graduation for the age of the moon, aperture for the moon phases at 6. Pink gold "alpha" and skeleton ?feuille? hands. M. Cal. RD 5637, stamped with the Seal of Geneva quality mark, rhodium-plated, 21 jewels, straight-line lever escapement, monometallic balance adjusted to 5 positions, shock absorber, self-compensating Breguet balance spring, micrometer regulator. Dial, case and movement signed. Diam. 37 mm. Thickness 13 mm.