2018–present · 40mm · caliber Patek Cal. 240 Q: ultra-thin automatic perpetual calendar, 21,600bph, 48h PR, 27j, 275 parts; perpetual calendar module on 3mm-thick base movement; moon phase accurate to 1 day in 122 years
The 5740G Nautilus Perpetual Calendar in white gold is discontinued and one of the most sought Nautilus complications; secondary prices have risen sharply since production ended and clean, complete examples trade well above retail.
Editorial estimate, 2026 Q2. Actual prices vary by condition, date, and box/papers status.
Movement tier: unclassified · caliber Patek Cal. 240 Q: ultra-thin automatic perpetual calendar, 21,600bph, 48h PR, 27j, 275 parts; perpetual calendar module on 3mm-thick base movement; moon phase accurate to 1 day in 122 years · 48h power reserve (2 days) · family design Gérald Genta
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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Discontinued and highly collectible; full papers and ideally a Patek service record are required to verify authenticity on the secondary market.
Known issues in the market
Discontinued status makes the 5740G a high-target for counterfeiting; require full Patek papers before purchase.
Cal. 240 Q uses a peripheral micro-rotor; the Nautilus caseback should show this architecture clearly.
Area
What to check
What is correct
Red flag
caseback
Cal. 240 Q micro-rotor in Nautilus caseback
Peripheral micro-rotor architecture visible through Nautilus caseback; ultra-thin movement profile
Full-size center-mounted rotor; not the 240 Q architecture
dial
Nautilus horizontal dial layout with perpetual calendar
All four perpetual calendar indications fitting the horizontal Nautilus dial format; indications reading correctly
Any lagging perpetual calendar indication; dial layout inconsistent with 5740G specifications
case
Nautilus case with porthole shape and integrated bracelet
Nautilus porthole case shape; integrated stainless steel bracelet with correct finishing; no visible modification marks
Any aftermarket bracelet; case showing re-polishing that has rounded the Nautilus case edges
Common legitimate replacements
Missing papers on a discontinued high-value reference is a serious red flag; do not proceed without full documentation.
Expert resources: Patek Philippe 5740G product documentation. Patek Nautilus authentication resources.
Authentication guide
Last reviewed June 2026
The 5740G pairs the Nautilus sport-watch case with a perpetual calendar in white gold. It is among the most complex and expensive current Nautilus references. The perpetual calendar apertures on the Nautilus dial layout, and Cal. 240 Q confirmation, are the authentication centerpieces.
Known reproduction risks
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HIGH RISK
Replica Nautilus watches with simulated perpetual calendar apertures, often using printed dial plates rather than genuine aperture cutouts with disc mechanisms.
Calendar apertures that are printed or engraved on the dial surface rather than genuine windows with rotating discs behind them
Flat embossed stripe texture without the tactile depth of genuine Nautilus dials
Exhibition caseback showing a generic automatic movement without the ultra-thin peripheral micro-rotor architecture
Bracelet in steel rather than white gold, detectable by the warmer polish color of genuine white gold
At the price tier of the 5740G, professional authentication by a watchmaker with movement exposure is the collector standard before any transaction.
Dial variants by era
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Era
Description
Identifiers
2015 to 2021 (standard production; discontinued)
White gold Nautilus case, blue horizontal embossed dial, four perpetual calendar apertures.
Blue horizontal embossed Nautilus stripe texture across the full dial
Day aperture (upper left), month aperture (upper right), leap year indicator (upper right area), moonphase aperture (6 o'clock)
Pointer date hand tracking a peripheral date ring
"Patek Philippe" applied text in the upper dial zone
Luminescent applied baton indices in the Nautilus style
White gold integrated bracelet
Service part flags
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Dial
Original: Blue horizontal Nautilus embossed stripe texture with perpetual calendar apertures cut into the dial surface. The apertures must have clean, machined edges with no print or surface treatment inconsistency near the openings.
Replacement tells
Embossed stripe texture that fades or becomes shallow near the aperture edges
Flat "Patek Philippe" applied text without the correct raised shadow
Aperture edges that appear rough or show lacquer bleed-over from the finishing process
Moonphase disc
Original: Deep blue moonphase disc with two moon discs and applied or high-quality printed gold stars. The moonphase aperture at 6 o'clock should show a precisely positioned moon disc with sharp edge definition.
Replacement tells
Moonphase disc with flat-printed gold stars rather than high-quality applied or contrasted stars
Moon disc color inconsistent with the dial blue -- the moonphase disc should complement the overall blue palette
Bracelet
Original: White gold integrated Nautilus bracelet with brushed center links and polished outer links. The bracelet tapers toward the butterfly deployant clasp. The "PP" clasp is in white gold.
Replacement tells
Bracelet in steel rather than white gold -- the 5740G is white gold throughout
Center links with incorrect brushing direction
Bracelet that does not taper correctly toward the clasp
Peripheral micro-rotor visible winding from the case rim
"Patek Philippe" on the movement plate
Reference 5740G-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 automatic perpetual calendar at 3.98mm. The peripheral micro-rotor winds from the case rim, which is the reason the movement bridges are fully visible through the exhibition caseback.
The micro-rotor is visible as a small sector winding mechanism at the case periphery, not a central rotor. Its absence or replacement with a central rotor indicates the wrong movement.
Gyromax balance wheel with four gold weights, Spiromax flat hairspring (appears blue-violet under magnification), and Geneva Seal finishing on all bridges.
Perpetual calendar function: all months should advance correctly without manual correction. The pointer date hand should track precisely to the peripheral date ring position.
The moonphase display has an accuracy of approximately 24 hours in 10 years. Any moonphase requiring correction more than once per year after a known-good setting indicates a worn or replaced moonphase module.
