lot 135

Patek Philippe

Advanced Research Perpetual Calendar Ref. 5550P in Platinum

This lot has a reserve price
Estimate CHF 70 000 / CHF 140 000
Starting bid CHF 70 000
Location
Freeport, Zurich

Hammer price CHF 110 000
Total bids 5
Buyer’s premium will not be charged

Specification

CaseRound case in platinum with crown at 3 o'clock, calendar pushers around the case flanks, display caseback with magnifying glass over the escapement
StrapBrown suede strap with Patek Philippe deployant clasp in platinum
DialSilver vertically-brushed dial with applied gold indices, luminous gold leaf hands, month and leap year at 3 o'clock, moonphase and date at 6 o'clock, day and 24 hour indicator at 9 o'clock, signed 'Patek Philippe' at 12 o'clock and 'Advanced Research' at 6 o'clock
MovementAutomatic mechanical movement Cal. 240 Q Si, functions: hours, minutes, day, date, month, 24 hour indicator, leap year, moonphase, Advanced Research escapement
Cal.240 Q Si
Ref.5550P
Movement No.5627923
Case No.4749555
Diameter:37mm
Lug-to-lug45mm
Year2011

Condition report

Case:Very good, minor signs of wear
Strap:Very good, minor signs of wear
Dial:Mint condition
Movement:Good, all functions working properly
Amplitude (Dial on top/Lift angle 52):Approximately 270°
Accuracy (Dial on top):Approximately +10 sec/day
Box:Yes
Papers:Yes

Reasons to Bid

The Patek Philippe Ref. 5550P ‘Advanced Research’ is the fourth installment of Patek Philippe’s experimental Advanced Research programme and one of the most important practical demonstrations of the maison’s silicon-based innovations. Unveiled at Baselworld 2011, the 5550P marries a classical perpetual-calendar wristwatch aesthetic with a radical, full-silicon regulating organ assembly, the OscilloMax ensemble, to create a watch that is at once conservative in appearance and revolutionary in technique. The 5550P is based on the 5140, but with a major technical twist. Although visually close to Patek’s standard 5140/5141 family of perpetual calendars, the 5550P is executed in platinum with a restrained, vertically brushed silver dial, applied gold hour markers and a discreet loupe on the on the caseback that highlights the Advanced Research escapement. The reference was produced in a strictly limited edition of 300 pieces. At the heart of the Ref. 5550P sits the automatic Caliber 240 Q Si — a derivation of Patek’s venerable micro-rotor Cal. 240 Q (perpetual calendar) engineered to incorporate an all-silicon regulating and escapement sub-assembly. Patek grouped the silicon components under the trade name OscilloMax®, which for this Caliber comprises:

  • Spiromax® balance spring (silicon)

  • Pulsomax® escapement (silicon lever and escape wheel geometry)

  • GyromaxSi® balance wheel (a new Silinvar® balance wheel with gold poising weights)

Together these elements replace conventional steel/brass escapement parts and deliver tangible performance benefits: improved energy efficiency, higher isochronism, enhanced resistance to magnetic fields, and a substantially increased power reserve of approximately 70 hours for the 240 Q Si versus the standard 240 Q.