Wristwatch · 10-day power reserve wristwatch

Patek Philippe Ref. 5100R 10 Days

Partially verified

This Patek Philippe Ref. 5100R is an 18K pink gold wristwatch released in 2000 as part of a limited edition of 750 pieces commemorating the third Millennium. The watch features a distinct rectangular, manta ray-shaped case measuring 34 x 46 mm with a 12 mm thickness, equipped with a transparent case back secured by four screws and sapphire crystals. The dial is finished in gray and includes applied pink gold dart indexes and Arabic numerals. Horological functions include central dauphine hands, a subsidiary seconds dial at 6 o'clock, and an up-and-down power reserve indicator located at 12 o'clock. The watch is powered by the Caliber 28-20 / 220, a rhodium-plated movement with fausses cotes decoration, 29 jewels, and a 10-day power reserve generated by a double-barrel system. It is fitted with an 18K pink gold Patek Philippe buckle and includes a fitted box and Certificate of Origin.

Front view of the Patek Philippe Ref. 5100R showing the gray dial with 10-day power reserve indicator at 12 o'clock. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: catalog.antiquorum.swiss
Category: Wristwatch · 10-day power reserve wristwatch
Maker / attribution: Patek Philippe
Reference: 5100R
Catalogue / lot identifier: 746
Source-reported date: 2000
Source-reported place: Switzerland
Source-reported serial: 3201763

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 Patek Philippe Ref. 5100R is housed in a solid 18K pink gold case described as rectangular and manta ray-shaped. It features a polished finish, a protected winding crown, and sapphire crystals on both sides, with the back secured by four screws. The dimensions are 34 mm by 46 mm with a total thickness of 12 mm. The watch is confirmed as water-resistant by the auction documentation.

The dial is gray, contrasting with applied pink gold dart indexes and Arabic numerals. It includes a subsidiary seconds dial positioned at the 6 o'clock mark and an up-and-down power reserve indication located at 12 o'clock. The time is displayed via pink gold dauphine hands. The dial, case, and movement are signed by the manufacturer.

Evidence for this section

“rectangular lozenge-shaped, water-resistant, 18K pink gold wristwatch”
“manta ray-shaped, solid, polished, transparent case back with 4 screws”
“Gray with applied pink gold dart indexes and Arabic numerals, subsidiary seconds dial at 6, up-and-down power reserve indication at 12”

Movement and Escapement

The watch is driven by the Caliber 28-20 / 220 movement, which is rhodium-plated and features fausses cotes decoration. The movement includes 29 jewels, nine of which are set in 18K gold chatons. It is engineered with a double-barrel system to achieve a 10-day power reserve. The escapement is a straight-line lever type, paired with a Gyromax balance that is adjusted for heat, cold, isochronism, and five positions.

Additional features include a shock absorber system and a self-compensating free-sprung flat balance spring. The movement is marked with the Seal of Geneva Quality Mark, certifying the quality of its components and assembly.

Evidence for this section

“M. Cal. 28-20 / 220, stamped with the Seal of Geneva Quality Mark”
“double-barrel”
“Gyromax balance adjusted to heat, cold, isochronism and 5 positions”
“29 jewels, 9 of them in 18K gold chatons”

Provenance and Authenticity

This watch was manufactured in 2000 as part of a restricted production run of 750 pieces created to celebrate the third Millennium. The lot is accompanied by its original fitted box and the Certificate of Origin. The auction description reports the object's condition as 'very good' for the case and movement, and 'as new' for the dial.

The watch is presented with an 18K pink gold Patek Philippe buckle. The documentation provided confirms the movement number as 3201763.

Evidence for this section

“Made in 2000 in a limited edition of 750 pieces”
“Accompanied by a fitted box and Certificate of Origin”
“Grading System Grade: AA Very good”

Open research questions

What is the specific historical significance of the 'Manta Ray' case shape within Patek Philippe's design history?
Are there known variations in the 750-piece production run beyond the metal type?

Source evidence

Recorded claims and source quotations for Patek Philippe Ref. 5100R 10 Days
Field	Source-reported value	Source quotation
Maker	Patek Philippe	“Patek Philippe, Genève”
Reference	5100R	“Ref. 5100R”
Serial	3201763	“movement No. 3201763”
Edition	Limited edition of 750 pieces	“limited edition of 750 pieces in 18K pink gold to celebrate the third Millennium.”
Movement	Cal. 28-20 / 220	“M. Cal. 28-20 / 220, stamped with the Seal of Geneva Quality Mark”
Dimensions	34 x 46 mm	“Dim. 34 x 46 mm.”
Power Reserve	10-day	“10-day power reserve”

Visible details

Gray dial with applied pink gold indexes and numerals
Up-and-down power reserve indicator at 12 o'clock
Subsidiary seconds dial at 6 o'clock
Transparent case back with four screws

Research qualifications

Condition grading is an opinion of the auction house
Completeness of the original box is not independently verified

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

Consulted source

Ref. 5100R Pink Gold 10 Days Patek Philippe, Genève, "10 Jours", movement No. 3201763, Ref. 5100R. Made in 2000 in a limited edition of 750 pieces in 18K pink gold to celebrate the third Millennium. Very fine and rare, rectangular lozenge-shaped, water-resistant, 18K pink gold wristwatch with 10-day power reserve and an 18K pink gold Patek Philippe buckle. Accompanied by a fitted box and Certificate of Origin. To be sold without reserve

Reviewed 2026-10-26 · Record 5375c0ab7e

Terms in this record

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