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The Encyclopedia of Horology

Wristwatch · Tourbillon wristwatch

Patek Philippe 10 Days Tourbillon Ref. 5101P

Partially verified

This Patek Philippe 10 Days Tourbillon, Reference 5101P, is a rectangular, curved platinum wristwatch sold in May 2005. It features an Art Deco-inspired case design with stepped sides and a single Top Wesselton diamond set between the lugs at 6 o'clock. The watch is powered by the manual-wind Caliber TO 28-20/222, which incorporates a one-minute tourbillon regulator and tandem mainspring barrels to achieve a 10-day power reserve. The salmon-colored dial is distinguished by applied black oxidized gold Breguet numerals and matching feuille hands. The movement is rhodium-plated, finished with fausses cotes, and bears the Seal of Geneva. It is equipped with a Gyromax balance and a free-sprung Breguet balance spring. The watch is accompanied by its Certificate of Origin, original booklets, and a fitted box. The assembly is secured with an 18K white gold Patek Philippe deployant clasp.

Front view of the Patek Philippe 10 Days Tourbillon Ref. 5101P, showing the salmon dial and stepped platinum case.
Front view of the Patek Philippe 10 Days Tourbillon Ref. 5101P, showing the salmon dial and stepped platinum case. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Tourbillon wristwatch
Maker / attribution
Patek Philippe
Reference
5101P
Catalogue / lot identifier
333
Source-reported date
2005
Source-reported place
Switzerland
Source-reported serial
4244218

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Design

The watch features a rectangular, curved platinum case characterized by polished, stepped sides. A prominent feature is the integration of a Top Wesselton diamond placed between the lugs at the 6 o'clock position. The case includes a transparent back secured by four screws, allowing visibility of the internal mechanics, and utilizes sapphire crystals for both front and back protection.

The dial is finished in a salmon color, providing a distinct background for the applied black oxidized gold Breguet numerals. The layout includes a subsidiary dial for the constant seconds at the bottom and a power reserve indicator in the upper portion of the dial. Matching the hour markers, the watch utilizes black oxidized gold feuille-style hands for time indication.

Evidence for this section
  • “rectangular and curved, Art Deco-style platinum wristwatch”
  • “Top Wesselton diamond set between the lugs at 6”
  • “Salmon-colored with applied black oxidized gold Breguet numerals”

Movement and Regulation

At the heart of the timepiece is the Caliber TO 28-20/222, a rectangular movement stamped with the Seal of Geneva. It is rhodium-plated and features fausses cotes decoration. The movement houses 29 jewels, with 6 set in gold chatons. Mechanical efficiency is supported by tandem mainspring barrels, which facilitate a 10-day power reserve.

Regulation is handled by a one-minute tourbillon regulator mounted within an A-shaped cage under a polished steel bridge. The escapement is a lateral lever type. The movement utilizes a Gyromax balance, adjusted to heat, cold, isochronism, and 5 positions. Further technical components include a shock absorber and a self-compensating free-sprung Breguet balance spring.

Evidence for this section
  • “Cal. TO 28-20/222, rectangular, stamped with the Seal of Geneva Quality Mark”
  • “tandem mainspring barrels for 10-Day power reserve”
  • “lateral lever escapement with oneminute tourbillon regulator with A-shaped cage under a polished steel bridge”

Documentation and Accessories

The watch was officially sold on May 20th, 2005. It is accompanied by the original Certificate of Origin, which serves as official documentation for the piece. In addition to the certificate, the object is provided with its original fitted box and accompanying booklets. The watch is worn on an 18K white gold Patek Philippe deployant clasp.

The auction description provides a grading system for the object, noting the case in 'very good' condition (Grade 2) and the movement and dial in 'as new' condition (Grade 1). All primary components, including the dial, case, and movement, are signed by the maker.

Evidence for this section
  • “Sold on May 20th , 2005.”
  • “Accompanied by the Certificate of Origin, booklets and fitted box.”
  • “Dial, case and movement signed.”

Open research questions

  • What is the specific composition of the booklet set included with the original sale?
  • Has the watch received factory-authorized maintenance or service since its original 2005 sale?

Source evidence

Recorded claims and source quotations for Patek Philippe 10 Days Tourbillon Ref. 5101P
FieldSource-reported valueSource quotation
MakerPatek Philippe, Genève“Patek Philippe, Genève”
Reference5101P“Ref. 5101P”
Movement Number3361136“movement No. 3361136”
Case Number4244218“case No. 4244218”
Date of SaleMay 20, 2005“Sold on May 20th , 2005.”
Movement CaliberTO 28-20/222“Cal. TO 28-20/222”
Case MaterialPlatinum“platinum wristwatch”
Dimensions30 x 52 mm“Dim. 30 x 52 mm.”
Jewel Count29“29 jewels”

Visible details

  • Salmon-colored dial with power reserve and tourbillon indicators
  • Stepped case profile with visible diamond setting at the bottom lugs
  • Applied black oxidized gold Breguet numerals
  • Rectangular movement construction visible in the design

Research qualifications

  • The specific identity of the 'booklets' accompanying the watch is not listed beyond the general description.
  • The long-term performance history following the 2005 sale remains undocumented in the provided text.

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

10 Days Tourbillon Patek Philippe, Genève, '10 Days Tourbillon', movement No. 3361136, case No. 4244218, Ref. 5101P. Sold on May 20th , 2005. Extremely fine and very rare, rectangular and curved, Art Deco-style platinum wristwatch with oneminute tourbillon regulator, tandem mainspring barrels for 10-Day power reserve and an 18K white gold Patek Philippe deployant clasp. Accompanied by the Certificate of Origin, booklets and fitted box.

Reviewed 2026-10-26 · Record 6e633fe8dc

Terms in this record

Glossary explanations for terms named in this object’s record.

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