Important Modern & Vintage Timepieces
Monaco, Jul 19, 2022
LOT 102
REF. 5250 G-001, SELF-WINDING, CENTRE-SECONDS; ANNUAL CALENDAR, MOON PHASES, POWER RESERVE; LIMITED EDITION OF 100 PIECES; "ADVANCED RESEARCH"; 18K WHITE GOLD
EUR 60,000 - 120,000
USD 64,000 - 128,000 / HKD 496,000 - 1,000,000 / CHF 61,000 - 122,000
| Grading System | |
|---|---|
Grade: |
|
Case: 2-8 |
Very good Slightly scratched |
Movement: 1* |
As new Overhaul recommended, at buyer's expense |
Dial: 1-01 |
As new HANDS Original |
Brand Patek Philippe, Geneva
Model "Advance Research" "Annual Calendar"
Reference 5250 G-001
Year circa 2005-2006
Movement No. 3 636 074
Case No. 4 339 176
Material 18K white gold
Bracelet black leather strap
Buckle 18K white gold PP deployant clasp
Diameter 39 mm. (bezel)
Caliber 315 S IRM QA LU (SI), Silicon escape wheel and Silinvar Spiromax ® hair-spring, adjusted to temperatures and 5 positions, Geneva Quality Hall Mark, 36 jewels
Height 46.8 mm.
Width 39 mm.
Weight 83 gr. (approx.)
Signature dial, case and movement
Accessories original fitted box and outer box, certificate of origin, booklets
Notes
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:
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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.
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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.