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Movement tier: unclassified · caliber Ulysse Nardin Cal. UN-374: in-house skeletonised automatic, 21,600bph (3Hz), 90h PR, 21j; 199 components, titanium mainplate and bridges, silicon escapement and balance spring · 90h power reserve (3.8 days)
Large case: suits wrists 7 in+ (18 cm+)
44 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.
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A 44mm skeletonised diver built to weigh under 46 grams without its strap, using recycled fishing net and carbon fibre alongside titanium. It is NOT a tourbillon, despite being widely described as one, and a listing claiming a tourbillon is describing something else.
Known issues in the market
Ulysse Nardin's own functions line reads "Hours, minutes and seconds. Manufacture skeleton movement." There is no tourbillon in this watch. Verify against the maker's page before paying for a complication that is not there.
The extreme lightness is the point of the reference. A Diver [AIR] that feels like a normal titanium diver is worth questioning.
The side parts are Nylo-Foil, made from recycled fishing net, and Carbonfoil on the bezel. Both are composites with visible irregular structure rather than uniform colour.
Area
What to check
What is correct
Red flag
movement
Absence of a tourbillon
A skeletonised UN-374 with an oversized silicon oscillator and nickel flyweights, and no rotating carriage
Any rotating cage, which would mean this is not the reference described
case
Weight
Around 52g on the strap, under 46g without it
Weight in the range of a conventional titanium diver
case
Carbonfoil structure
Irregular composite grain, unique to each piece
Uniform moulded colour with a repeating pattern
dial
Skeletonised indices
Floating indices and openworked hands with white Super-LumiNova
A solid dial plate
Common legitimate replacements
Straps are consumable and are part of the weight claim; a heavier strap changes the figure.
Composite bezel parts are not generally repairable and are replaced.
Expert resources: Ulysse Nardin can confirm the reference. Note that this catalog's other Ulysse Nardin Diver row carried an incorrect reference format until 2026-09-09.
