Name: Patek Philippe Perpetual Calendar 5320G 5320G-001
Brand: Patek Philippe
SKU: 5320G-001

The 5320G is Patek Philippe's current 40mm perpetual calendar in white gold, running the in-house 324 S Q caliber. It replaced the 5140G in 2017 with a cleaner, fully integrated dial where all subdials sit flush with the dial plane rather than stepping up from it. Collectors drawn to the perpetual calendar complication at a wearable size land here because nothing else at this diameter carries this movement quality.

What it is

Patek introduced the 5320G-001 at Baselworld 2017, slotting it above the 5327G in the perpetual calendar lineup. The 324 S Q is a self-winding movement with a rotor that partially obscures the movement but delivers 45 hours of power reserve and the signature Patek perpetual calendar module. White gold is the only metal offered; there is no steel, yellow gold, or rose gold reference in the 5320G family.

The silvery opaline dial with applied baton indices and railroad minute track reads closer to the Grand Complications style than the more classical sector-dial 5327. No significant dial variant exists beyond the original release, which keeps comparisons simple.

Buying notes

Check the date corrector pushers at 2, 4, 8, and 10 o'clock for dents or dings from misuse with a blunt tool; proper perpetual calendar correction requires a stylus and these pieces are routinely abused by prior owners. The 40mm white gold case polishes aggressively and many pre-owned examples show over-polished lugs that bleed into the brushed surfaces. Confirm the movement has not been serviced by an independent without Patek-approved parts, particularly the perpetual cam stack, as incorrect reassembly shows up as date jumps at month boundaries.

Dial authenticity is rarely faked at this price tier, but verify the applied indices have not been re-glued after a crystal replacement job. Water resistance is 30 meters, so inspect the case back gasket condition and ask for service records if the watch has seen any moisture exposure.

Market read

Retail is approximately $58,000 USD, and the 5320G trades close to or slightly above retail on the secondary market given continued production constraints at Patek. Unlike the 5140G it replaced, the 5320G has not yet had time to appreciate dramatically, so buyers paying a 10-15% premium over retail are in normal territory rather than speculative. The white gold case limits liquidity relative to a steel or rose gold perpetual calendar, but the collector audience for white gold Patek is loyal and stable.

Condition matters acutely here; a polished example can lose $5,000-8,000 compared to an unpolished piece with original surface texture.

Service expectations

The 324 S Q carries a recommended service interval of approximately 3-5 years for a full perpetual calendar service, though Patek's official guidance suggests up to 10 years under normal use. A factory service at Patek Philippe typically runs $3,000-5,000 USD for a perpetual calendar movement including movement service, seal replacement, and case refinishing if requested. Decline case refinishing unless the watch genuinely needs it; preserving original surfaces protects resale value.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Common#3 in familyOfficial press photos

Condition affects price

Pre-owned watches trade across a wide condition spectrum. These ranges are typical for the secondary market.

New Old Stock

Unworn example retaining original packaging, tags, and warranty documentation.

+30–50% vs median

Unpolished

Worn but the case has never been polished; original brushed and polished surfaces are intact.

+15–25% vs median

Polished

Case has been professionally or amateur polished at some point; edge definition is softened.

-15 to -5% vs median

Recently Serviced

Movement has been recently serviced with documented service records; case condition varies.

At median

Project

Needs service, has dial or hand issues, non-original parts, or other remediation before daily wear.

-50 to -25% vs median

Full condition grading guide →

Market price

$70,000–$100,000

gold·2026 Q2

Price trend chart coming soon

The 5320G Perpetual Calendar in white gold with retrograde date display is one of the most legible perpetual calendar layouts Patek has produced; secondary prices are firm due to clean dial design and limited supply.

Editorial estimate, 2026 Q2. Actual prices vary by condition, date, and box/papers status.

Movement tier: unclassified · caliber Patek Cal. 324 S Q: automatic with annual calendar, 28,800bph, 45h PR, 33j; Gyromax balance; used in Perpetual Calendar 5320G; full perpetual variant · 45h power reserve

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

This is an annual calendar, not a perpetual calendar; it requires once-per-year manual correction at the end of February.

Known issues in the market

Listings frequently and incorrectly describe this as a perpetual calendar; it is an annual calendar requiring February end correction.
The Gyromax balance and Spiromax hairspring are premium components; verify through caseback.

Area	What to check	What is correct	Red flag
caseback	Cal. 324 S Q with Gyromax and Spiromax	Cal. 324 S Q visible through caseback; Gyromax adjustable balance wheel and Spiromax hairspring confirmed	Any caliber other than 324 S Q; standard hairspring without the Spiromax designation
dial	Annual calendar display layout	Annual calendar indications reading correctly; case proportions and dial layout consistent with 5320G specifications	Any dealer or listing calling this a perpetual calendar; it requires February end correction
case	5320G white gold case	18k white gold case confirmed by hallmark inside the caseback; no pusher holes for calendar correction	Missing 18k hallmark; any claim of yellow or rose gold without supporting hallmark

Common legitimate replacements

Original Patek strap; factory replacements are acceptable.

Expert resources: Patek Philippe 5320G product documentation. Patek annual calendar setting instructions.

Authentication guide

Last reviewed June 2026

The 5320G revives the classic perpetual calendar with retrograde date and traditional sub-dial layout, referencing vintage Patek perpetual calendars. The retrograde date arc and the movement architecture visible through the caseback are the primary verification points.

Known reproduction risks

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MEDIUM

Replica perpetual calendar watches with a retrograde date arc targeting the 5320G vintage-inspired layout.

Retrograde date pointer with gradual rather than instantaneous snap-back
Hands that are black rather than correctly blued steel
Exhibition caseback showing a generic automatic movement without the retrograde module architecture
Sub-dial railroad chapter rings with incorrect proportions or typography

Dial variants by era

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Era	Description	Identifiers
2021 to present (standard production)	White gold case, silver opaline sector dial with retrograde date arc and four sub-registers.	Retrograde date arc at 12 o'clock with a sweeping pointer hand Day sub-dial at 9, month sub-dial at 3, and moonphase aperture at 6 Leap year indicator at approximately 4 o'clock "Patek Philippe" and "Geneve" applied text in the upper sector Enamel-style sub-dial finish with railroad chapter rings Blued steel hands referencing the vintage perpetual calendar aesthetic

Service part flags

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Retrograde date mechanism

Original: The retrograde date pointer sweeps from 1 to 31 and snaps back instantly to 1 at the end of each month (or end of the calendar's programmed date length). The snap-back is instantaneous, not gradual.

Replacement tells

Gradual rather than instantaneous date snap-back -- indicates worn retrograde spring
Retrograde pointer that oscillates or overshoots the date position before settling

Blued steel hands

Original: Heat-blued steel hour, minute, and retrograde pointer hands referencing the vintage Patek calendar aesthetic. The blue is a deep navy with gradation toward the tips, thermally achieved.

Replacement tells

Hands that appear black rather than true blued steel blue
Uniform synthetic blue coating without the correct thermal gradation
Retrograde pointer in white gold or a non-blued finish -- incorrect for this reference

Case back markings

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2021 to present

Exhibition caseback displaying Cal. 240 Q self-winding perpetual calendar movement
Retrograde date module architecture visible through the caseback
"Patek Philippe" on the movement plate
Reference 5320G-001 and serial number on the case flank
18K white gold hallmark

Movement tells

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Cal. 240 Q is an ultra-thin self-winding perpetual calendar at 3.98mm total height. The peripheral micro-rotor winds from the case rim, preserving the movement view through the exhibition caseback.
The perpetual calendar mechanism uses the standard Patek cam-lever architecture. All calendar indications should be correct through all months and years including February 28/29.
Gyromax balance wheel with four gold weights. The Spiromax flat hairspring appears blue-violet under magnification.
The retrograde date spring must snap the pointer from 28/29/30/31 to 1 with no delay or partial travel -- a slow retrograde return indicates a spring in need of replacement.
Cotes de Geneve striping, polished chamfers, and mirror-flat main plate are the Geneva Seal requirements. Any coarse surface indicates a non-original or improperly serviced movement.

Sources: Patek Philippe Extract of the Archives service; Phillips Watches -- Patek perpetual calendar auction documentation.