Ulysse Nardin
Diver [AIR]
Ref. 3743-170-2A/0A
2025–present · 44mm · 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
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Movement tier: unclassified
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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Authentication
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.
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Buying guidance
This watch on Ulysse Nardin’s site →
Sources for this entry: ulysse-nardin.com · monochrome-watches.com
Pre-purchase sheet → The numbers to check, what to look at and what to ask, on one printable page.