Important Modern & Vintage Timepieces

Hong Kong, Oct 27, 2019

LOT 480

PATEK PHILIPPE REFERENCE 5250 G, CENTRE-SECONDS, ANNUAL CALENDAR, MOON PHASES, POWER- RESERVE; “ADVANCED RESEARCH”; LIMITED EDITION OF 100 PIECES; 18K WHITE GOLD

18K white gold, self-winding, tonneau-shaped, gentleman’s wristwatch, with centre-seconds and five horological complications: annual calendar; date of the month; day of the week; month of the year; phases of the moon; power-reserve indication. Polished two-piece case, with sapphire-crystal screwed case-back inscribed “Patek Philippe Advanced Research”. Brushed silver colour dial with suspended Roman numerals and radial indexes; “Superlumin” dots and hands.

Brand Patek Philippe, Geneva

Model “Annual Calendar” “Superlumin” “Advanced Research”

Reference 5250 G

Year Circa 2005-2006

Movement No. 3 636 068

Calibre  315 / 266 IRM QA aut LU(SI), Silicon escape wheel and Silinvar Spiromax ® hair-spring, adjusted to temperatures and 5 positions, Geneva Quality Hall Mark

Bracelet Black leather Patek Philippe strap, 18K white gold Patek Philippe deployant clasp

Diameter 39 mm.

Signature Dial, case and movement

Accessories Original fitted box, certificate of origin booklets

HKD 450,000 - 600,000

CHF 56,250 - 75,000 / USD 57,350 - 76,450

Sold: HKD 562,500


Grading System
Grade: AAA

Excellent

Case: 3-6

Good

Slightly oxidized

Movement: 1*

As new

Overhaul recommended, at buyer's expense

Dial: 1-01

As new

HANDS Original


Notes

Patek Philippe, Reference 5250, with Silicon escape wheel and Silinvar Spiromax ® hair-spring
This limited special version of the Annual Calendar was presented in 2005 and was the first Patek Philippe watch to incorporate silicon-based technology. This reference was produced in two limited editions:
• Ref. 5250 G, 18K white gold; limited edition of 100 pieces launched in 2005.
• Ref. 5250 R, 18K pink gold; limited edition of 300 pieces launched in 2006. 
The Spiromax ® hair-spring 
Spiromax ® is a totally new type of hair-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 Research Department at Patek Philippe developed a new terminal curve design using the Silinvar hair-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 centre 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.
The Silicon Escape Wheel
The Ref. 5250 and the Ref. 5350 uses the Silicon escape wheel in a Swiss lever escapement launched in 2005.The advantages of using silicon is that it is antimagnetic, very hard, lightweight and corrosion resistant, above all the locking tooth faces never need to be lubricated.