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Movement tier: unclassified
Large case: suits wrists 7 in+ (18 cm+)
43 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.
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Authentication
Never advance a perpetual calendar between 9pm and midnight; all four calendar indications must be verified.
Known issues in the market
- Setting protocol violation between 9pm and midnight can damage the perpetual calendar mechanism.
- Sapphire leap year disc must be present and correctly aligned.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | All four perpetual calendar indications | Date, day, month, and leap year all displaying correctly and advancing at correct intervals | Any perpetual calendar indication non-functional; incorrect date or month advancing |
| movement | Leap year sapphire disc | Sapphire leap year disc present and correctly aligned; visible through caseback or dial | Leap year disc absent; incorrect alignment; non-sapphire disc substituted |
| caseback | Cal. 96.22-L Geneva Seal | Cal. 96.22-L designation; Geneva Seal finishing; Cotes de Geneve and beveled edges under magnification | No Geneva Seal; non-L.U.C caliber; standard finishing without required decoration |
Common legitimate replacements
- Leather strap; Chopard OEM alligator preferred.
- Crystal; sapphire standard.
Expert resources: Chopard L.U.C Perpetual Twin press materials. Perpetual calendar setting protocol documentation.
Authentication guide
Last reviewed July 2026
The L.U.C Perpetual Twin uses a twin-barrel, 22k gold micro-rotor movement (Cal. 96.22-L) that keeps the case thin for a perpetual calendar automatic. There is no moonphase on this reference -- the display is day, twin-aperture date, month, and a leap-year indicator good until 2100.
Sources: Chopard -- L.U.C Perpetual Calendar movement documentation; Revolution -- Chopard L.U.C perpetual calendar analysis.





