The Mondani Collection of Rolex Wrist...

Geneva, May 14, 2006

LOT 570

Yellow Gold "Portuguese Secular Perpetual Calendar" International Watch Co., Schaffhausen, "Portuguese Perpetual Calendar", No. 2915680, Ref. 5021. Very fine and rare, large, self-winding, water-resistant, 18K yellow gold gentleman's wristwatch with secular perpetual calendar, moon phases, 7-day power-reserve and an 18K yellow gold IWC deployant clasp.

C. Three-body, solid, polished and brushed, concave lugs, transparent case back with 6 screws, sapphire crystals. D. Black with applied yellow gold Arabic numerals, outer dot minute markers, subsidiary dials for the seconds, the day, date, months and the 7-day up-and down indication, apertures for the moon phases and the years. Yellow gold "feuille" hands. M. Cal. C 50611, rhodium-plated, "fausses-côtes" decoration, 64 jewels, straight line lever escapement, monometallic balance adjusted to 5 positions, shock-absorber, self-compensating Breguet balance spring, micrometer regulator, hack mechanism, skeletonized bi-directional rotor with gold medallion inlay engraved "IWC ?Probus Scafusia?. Dial, case and movement signed. Diam. 44 mm. Thickness 15 mm.