The Art of American Horology Part ll,...

Roosevelt Hotel, Madison Avenue @ 45th Street, Dec 04, 2002

LOT 109

Roger Dubuis, Genève, "Bi-retrograde Calendar", No. 33. Produced circa 2000.Very fine, astronomic, 18K pink gold "Bulletin d'Obser-vatoire" gentleman's wristwatch with bi-retrograde calendar, perpetual and lunar calendar, moon phases and age, 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. D. black with applied pink gold dot indexes, auxiliary seconds and 30 minutes register dials, on the 12 off-center dial for the months and the leap years, 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. "Alpha" and "Feuille-skeleton" pink gold hands. M. Cal. RD 5637, stampedwith the Geneva Quality Hallmark, rhodium-plated, 21 jewels, straight line lever escapement, monometallic balance, 5 adjustments, shock-absorber, self-compensating Bre-guet balance spring, micrometer regulator.Dial, case and movement signed.Diam. 37 mm.