Wristwatch · Manually-wound wristwatch

Patek Philippe Reference 5100 "10 Jours" Wristwatch

Partially verified

This Patek Philippe "10 Jours" gentleman's wristwatch, reference 5100, is housed in an 18K white gold, rectangular lozenge-shaped case. Produced in a limited edition to mark the year 2000, it features a navy blue dial with applied white gold dart indexes and Arabic numerals. A significant technical component of this model is the Caliber 28-20/220, a manually-wound movement equipped with a double barrel that provides a ten-day power reserve, indicated on the dial below the twelve o'clock position. The movement is finished with Geneva Quality Hallmark, fausses-côtes decoration, and includes twenty-nine jewels. The caseback is transparent, held by screws, allowing visibility of the movement. This specimen is part of a limited production run for the reference 5100.

Front view of the Patek Philippe 5100 wristwatch with navy blue dial and power reserve indicator. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: catalog.antiquorum.swiss
Category: Wristwatch · Manually-wound wristwatch
Maker / attribution: Patek Philippe & Cie
Reference: 5100
Catalogue / lot identifier: 120
Source-reported date: 2000
Source-reported place: Switzerland
Source-reported serial: 3201606

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 distinctive rectangular, lozenge-shaped case constructed from 18K white gold. It is water-resistant and incorporates a polished, two-body design with a concave, stepped bezel. The winding-crown is inserted into the side of the case, and the watch is completed with a transparent back secured by screws, offering a view of the movement. The overall dimensions of the case are 34 mm by 46 mm, resulting in a pronounced, sculptural profile.

The dial is presented in a navy blue finish, complemented by applied white gold dart indexes and Arabic numerals. The hands are fashioned in the "Dauphine" style from white gold. A power reserve indicator for the ten-day movement is positioned below the twelve o'clock marker, while an auxiliary seconds dial is located at the six o'clock position.

Evidence for this section

“rectangular lozenge, 18K white gold gentleman's wristwatch”
“two-body, solid, polished, transparent case back with screws”
“up-and-down indication below the 12”

Movement and Technical Specifications

The watch is powered by the Caliber 28-20/220, described by the source as an entirely new Patek Philippe movement. It utilizes a double barrel system to achieve a ten-day power reserve, a technical feature the source describes as a first in the history of watchmaking. The movement is rhodium-plated and decorated with fausses-côtes. It comprises 29 jewels, nine of which are set in 18K gold chatons.

The mechanical assembly includes a straight-line lever escapement and a Gyromax balance adjusted for heat, cold, isochronism, and five positions. It also features a self-compensating, free-sprung flat balance spring and a shock-absorber.

Evidence for this section

“This watch has an entirely new Patek Philippe movement with 10-day power reserve”
“stamped with the Geneva Quality Hallmark, rhodium-plated, "fausses-côtes" deco”
“straight line lever escpement, double barrel”
“Gyromax balance adjusted for heat, cold, isochronism and 5 positions”

Provenance and Production

This watch was produced as part of a limited edition to celebrate the year 2000. According to the provided information, a total of 3000 examples of the reference 5100 were manufactured across four different metal variants: 1500 in yellow gold, 750 in pink gold, 450 in white gold, and 300 in platinum. The source notes that these white gold examples include a Top Wessleton diamond set between the lugs at the 6 o'clock position.

To ensure the exclusivity of this reference, the production states that the specialized tooling used to manufacture the cases will not be utilized for future watch production. The watch is accompanied by its original box and certificate. The auction report provides an 'Excellent' overall grading but recommends an overhaul of the mechanism.

Evidence for this section

“produced in 3000 examples only: 1500 in yellow gold, 750 in pink gold, 450 in white gold and 300 in platinum”
“the case production tools will never be used again”
“Grading System Grade: AAA Excellent”

Open research questions

What is the specific historical context or source for the claim regarding the 'first' ten-day power reserve in watchmaking history?
Does the specific specimen serial number 3201606 correspond to a specific position within the 450-unit white gold production run?

Source evidence

Recorded claims and source quotations for Patek Philippe Reference 5100 "10 Jours" Wristwatch
Field	Source-reported value	Source quotation
Maker	Patek Philippe & Cie	“Patek Philippe & Cie, Genève”
Reference	5100	“Ref. 5100”
Serial Number	3201606	“No. 3201606”
Movement	Cal. 28-20/220	“Cal. 28-20/220”
Material	18K white gold	“18K white gold gentleman's wristwatch”
Dimensions	34 x 46 mm	“Dim. 34 x 46 mm”
Power Reserve	10 days	“10-day power reserve”
Production year	2000	“brate the year 2000”

Visible details

Rectangular lozenge-shaped white gold case
Navy blue dial with 10-day power reserve indicator
Auxiliary seconds dial located at the six o'clock position
Transparent case back secured by screws

Research qualifications

Overhaul recommended as noted by the auction house
Current functional state of the movement not specified beyond grading

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

Consulted source

Patek Philippe & Cie, Genève, "10 Jours", No. 3201606, Ref. 5100. Pro-duced in a limited edition to cele-brate the year 2000.Fine water-resistant, rectangular lozenge, 18K white gold gentleman's wristwatch with 10-day power reserve with an 18K white gold Patek Philippe buckle. Accompanied by original box and certificate.

Reviewed 2026-10-26 · Record 980c60b97a

Terms in this record

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