Important Collectors Watches, Pocket ...

Hong Kong, Jun 08, 2008

LOT 413

Ref. 5350R, Limited Edition, Annual Calendar with Silicon Escape Wheel and Silinvar Spiromax Balance Spring Patek Philippe, Genève, ?Patek Philippe Advanced Research? Silicon Escape Wheel & Silinvar Spiromax Spring?, movement No. 3686300, Ref. 5350R. Made in a limited edition of 300 pieces in 2006, sold on December 4th, 2007. Very fine, rare and innovative, center-seconds, self-winding, waterresistant, 18K pink gold wristwatch with annual calendar, powerreserve indication, moon phases, silicon escape wheel, silinvar Spiromax balance spring and an 18K pink gold Patek Philippe deployant clasp. Accompanied by Certificate of Origin, fitted box and booklets.

HKD 600,000 - 800,000

USD 78,000 - 105,000 / EUR 48,000 - 65,000

Sold: HKD 660,000

C. Two-body, polished, transparent screwed-down case back with cyclops lens over the escape and balance wheels, curved bezel, correctors in the band, concave lugs, sapphire crystals. D. Brushed silver with applied pink gold baton indexes and Arabic quarterhour numerals, luminous dots, outer minute track, subsidiary dials for the days of the week, the months, aperture for the moon phases and the date at 6, power-reserve indication below 12. Luminous pink gold feuille hands. M. Cal. 324/267, stamped with the Seal of Geneva Quality Mark, rhodium-plated, fausses cotes decoration, 36 jewels, straight-line lever escapement, silicon escape wheel, the bridge with additional milled opening, Gyromax balance adjusted to heat, cold, isochronism and 5 positions, shock absorber, selfcompensating free-sprung silinvar Spiromax balance spring, 21K gold rotor with zirconium ball-bearings. Dial, movement and case signed, back crystal inscribed ?Patek Philippe Advanced Research?. Diam. 39 mm. Thickness 12 mm.

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Grading System
Case: 2

Very good

Movement: 2

Very good

Dial: 1-01

As new

HANDS Original


Spiromax Balance
IIs a totally new type of balance spring made of ?Silinvar?, a revolutionary material based on monocrystalline silicon. It was developed between two partners in the Swiss watch industry and a leading research institute. The Advanced Rresearch Department at Patek Philippe developed a new terminal curve design using the Silinvar balance spring. The patented Patek Philippe terminal curve is noticeably thicker at the outer end, forcing concentric development upon the Spiromax spring. This causes the expansion and contraction of the spring to be symmetric relative to its center over the entire plane of oscillation. The Patek Philippe terminal curve lies within this plane and can be crafted three times thinner than a spring with a Philips or Breguet overcoil, thus facilitating the construction of very thin movements. Silicon Escape Wheel The reference 5350 uses the silicon escape wheel first found in the Ref. 5250 launched in 2005. Silicon offers the advantages of being anti-magnetic, very hard, lightweight and corrosion-resistant, above all the locking tooth faces that never need to be lubricated.