The Patek Philippe 5402P brings a split-seconds chronograph and perpetual calendar together in a 40 mm platinum case, according to Fratello’s 2012 hands-on report. That report identifies the manually wound caliber CHR 29-535 PS Q and describes a silvery opaline dial with white-gold applied markers. A key reference distinction matters: Patek Philippe’s official technical release from the same period covers the related 5204P, not the 5402P, so its additional movement and case figures should be treated as technical context rather than confirmed 5402P specifications.
What Fratello reported about the 5402P
Fratello’s April 2, 2012 article presents the platinum 5402P as the successor to the 5004P. It reports a 40 mm case and an in-house, manually wound CHR 29-535 PS Q movement measuring 32 mm across and containing 496 parts. The article describes the watch as pairing a split-seconds chronograph with a perpetual calendar.
The dial, as described by Fratello, is silvery opaline with applied white-gold markers. Its calendar and astronomical indications show the day, date, month, leap year, day/night, and moon phase. Fratello listed CHF 260,000 including VAT in 2012; that is a historical reported price, not a current valuation or asking price. Read Fratello’s 2012 5402P article.
How the split-seconds chronograph works
A split-seconds chronograph has two chronograph hands that can be separated to record an intermediate time while the other continues measuring. Patek Philippe’s March 2012 technical release for the 5204P documents the CHR 29-535 PS Q movement family with two column wheels, a horizontal clutch, and an isolator in the split-seconds mechanism. The release explains that the isolator uncouples the split-seconds wheel while its hand is stopped, so the stopped wheel does not influence balance amplitude. This is useful technical context for the caliber, but the release is specifically for reference 5204P.
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Patek Philippe also reported that a redesigned lever improved positional congruence between the split-seconds and chronograph hands by 75% on the 5204P design. That is the manufacturer’s figure for the documented 5204P mechanism, not an independently verified performance measurement for the 5402P. See Patek Philippe’s 2012 5204P technical release.
What the perpetual calendar displays
On the 5402P, Fratello reports indications for day, date, month, leap year, day/night, and moon phase. A perpetual calendar is designed to account for months of different lengths and leap days. Patek Philippe’s general collection explanation says its perpetual calendars require correction in 2100; that is the manufacturer’s general explanation of the complication, not a separate verification of the 5402P’s specific calendar mechanism. Patek Philippe’s Grand Complications overview.
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For the related 5204P, Patek Philippe specifies a 182-part perpetual-calendar mechanism occupying 1.65 mm of movement height, with day and month apertures, an analog date, moon phase, leap-year, and day/night indications. These details illustrate the documented architecture of the 5204P, but should not be presented as a complete official specification of the 5402P.
5402P facts and 5204P technical context
| Detail | 5402P, as reported by Fratello in 2012 | 5204P, in Patek Philippe’s 2012 release |
|---|---|---|
| Case | Platinum; 40 mm diameter | 950 platinum; 40 mm diameter, 14.19 mm high; 30 m water resistance |
| Movement | Manually wound CHR 29-535 PS Q; 32 mm diameter; 496 parts | Manually wound CHR 29-535 PS Q; 496 parts; 34 jewels |
| Operating figures | Not stated in Fratello’s article | 65-hour power reserve; 28,800 semi-oscillations per hour (4 Hz) |
| Split-seconds mechanism | Split-seconds chronograph; further mechanism figures not stated in Fratello’s article | 42 parts, including isolator |
| Calendar mechanism | Day, date, month, leap year, day/night, and moon phase | 182 parts; 1.65 mm high; day and month apertures, analog date, moon phase, leap-year, and day/night indications |
The 5204P figures in the table are from Patek Philippe’s 2012 release. They are not a substitute for an official 5402P specification sheet.
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What is—and is not—established about price and availability
The CHF 260,000 including VAT figure is the price Fratello reported in April 2012. The available information here does not establish a current market price, present availability, or the 5402P’s production count. Anyone assessing a specific example should compare the exact reference and generation, case and dial details, provenance, and condition rather than treating the old retail figure as a present-day benchmark.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to read the 5402P’s relationship to the 5004P and 5204P
Fratello identifies the 5402P as successor to the 5004P, while Patek Philippe’s official release documents the related 5204P. The shared CHR 29-535 PS Q designation and overlapping complication set make the 5204P useful for understanding the caliber’s documented architecture, but do not make its case measurements, technical data, or release details proof of every 5402P specification. Keep the three references distinct when comparing a watch, a listing, or historical documentation.
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