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Ulysse Nardin Diver [AIR]
Reference 3743-170-2A/0A. A sheet to take with you: the numbers to check the watch against, what to look at, and what to ask. It does not authenticate anything and it does not tell you whether to buy.
Check the numbers
Measure or ask. A watch that does not match these is not necessarily wrong, but it is a question worth the answer.
| Case width | 44mm |
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| Thickness | 14.7mm |
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| Lug to lug | the brand publishes none |
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| Strap width | not recorded |
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| Water resistance | 200m |
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| Case material | titanium, carbon |
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| Crystal | sapphire |
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| Bezel | carbon |
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| Produced | 2025–present |
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| Movement | 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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Anything above marked not recorded is a gap in this catalog, not a property of the watch. Do not read a blank as a zero.
Before anything else
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.
What to look at
- movement Absence of a tourbillon
Correct A skeletonised UN-374 with an oversized silicon oscillator and nickel flyweights, and no rotating carriage
Red flag Any rotating cage, which would mean this is not the reference described
- case Weight
Correct Around 52g on the strap, under 46g without it
Red flag Weight in the range of a conventional titanium diver
- case Carbonfoil structure
Correct Irregular composite grain, unique to each piece
Red flag Uniform moulded colour with a repeating pattern
- dial Skeletonised indices
Correct Floating indices and openworked hands with white Super-LumiNova
Red flag A solid dial plate
Known issues on this reference
- 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.
Parts that are commonly replaced
- 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.
Ask the seller, whatever the watch
- When was it last serviced, by whom, and is there paperwork?
- Has the case ever been polished?
- Which parts are not original to it?
- Do you have the box, papers and the original bracelet or strap?
- Why are you selling it?
- Can I see it in daylight, and can I take a photo of the caseback?
What this sheet is standing on
The specifications above are sourced to ulysse-nardin.com, monochrome-watches.com. What else the catalog does not know.
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