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Movement tier: unclassified · caliber Ulysse Nardin Cal. UN-76: in-house automatic chronograph, 28,800bph, 48h PR; silicon components; used in Marine Chronograph 43; column-wheel; rotor with 18k gold mass · 48h power reserve (2 days)
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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The Marine Chronograph 43mm uses the in-house Cal. UN-76 column-wheel chronograph with silicon components. The column-wheel mechanism is visible through some movement orientations and the pusher action should be crisp. The 18k gold rotor mass is a specific tell for the genuine UN-76.
Known reproduction risks
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MEDIUM
Marine Chronograph replicas exist but the 18k gold rotor mass and silicon components are movement-level tells that distinguish genuine examples.
All-steel rotor visible through caseback instead of the gold-mass rotor of Cal. UN-76
Silicon escape components absent from the movement
Pusher action that lacks the crisp column-wheel click character
Dial text blurring or inconsistent character weight under loupe
Dial variants by era
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Era
Description
Identifiers
2012 to present
Current production Marine Chronograph in steel, 43mm. Blue, silver, or black dials with Arabic numerals and integrated chronograph layout.
Arabic numeral hours in the UN typeface
Chronograph pushers at 2 and 4 o'clock
"Marine Chronograph" text on the dial
"Ulysse Nardin" at 12 o'clock
Anchor logo on the dial
Screw-down chronograph pushers sealed for 100m water resistance
Date window at 3 o'clock position
Service part flags
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Chronograph pushers
Original: Screw-down chronograph pushers sealed for water resistance. The pushers must be screwed down (unlocked) before activating. Activation should produce a crisp, positive click consistent with a column-wheel mechanism.
Replacement tells
Pushers that do not screw down (non-sealed replacement pushers)
Pusher action that is mushy or lacks positive click (indicates worn or non-column-wheel mechanism)
Non-functional chronograph activation on either pusher
Movement rotor via caseback
Original: Exhibition caseback displaying Cal. UN-76. The rotor carries an 18k gold mass -- this appears as a distinctly warmer, gold-colored segment on the rotor arc compared to the steel movement components.
Replacement tells
Rotor without a gold-colored mass -- an all-steel rotor indicates movement replacement or non-original rotor
Movement layout inconsistent with Cal. UN-76 known bridge geometry
Silicon escape components absent (flat dark non-reflective components should be visible)
Anchor crown
Original: Screw-down crown with anchor logo on the end face. The crown screws down for 100m water resistance.
Replacement tells
Crown without anchor logo
Crown that does not screw down to seal
Crown with thread damage preventing proper seating
Case back markings
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2012 to present
Exhibition caseback with Cal. UN-76 visible
18k gold rotor mass visible as a warm-colored segment on the rotor arc
"Ulysse Nardin" on the movement plate or bridge
Silicon escape wheel and lever visible as flat dark components
Reference 1533-150-3/43 and serial number on the case band
Steel hallmark on the case band
Movement tells
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Cal. UN-76 is a column-wheel chronograph. The column wheel is visible under magnification through the caseback in some orientations. A column-wheel mechanism produces a notably crisper pusher action than a cam-actuated chronograph.
The 18k gold rotor mass is a specific production detail of the UN-76. Its absence on a stated genuine movement confirms a movement swap.
Silicon escape components in Cal. UN-76 should appear as flat, dark, non-reflective elements. Conventional metal components in their place indicate a non-original escapement.
Power reserve is approximately 48 hours. A Marine Chronograph stopping before 40 hours when fully wound warrants service.
