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Ulysse Nardin Diver [Air] 3743-170-2A/0A



Ulysse Nardin Unveils Lightest Diving Watch Ever

Only 52 grams.

At Watches & Wonders 2025, Ulysse Nardin unveiled the Diver [Air], the lightest mechanical diving watch ever. Weighing just 52 grams including the strap, this latest diver’s watch is unexpected and impressive in many ways.

UN’s engineers have managed to combine lightness with practicality in the Diver Air. The case, strap and, above all, the movement have all been carefully designed to reduce weight as much as possible – without compromising structural reliability. The Diver Air weighs 52 grams with the strap and 46 grams without it, which is about the weight of 10 sheets of A4 paper. replica luxury watches

As impressive as the Diver Air is, it doesn’t look like it, which is arguably its greatest weakness. Visually, the Diver Air is virtually indistinguishable from the standard Diver X Skeleton, which is a shame because the two are completely different. The result is a missed opportunity to create something whose appearance is consistent with its essence, an ultra-light performance watch.

Yet the movement is presented in a modern style, with clear sapphire gemstones and a clean, industrial finish. swiss replica watches

Seven-gram UN-374 movement
At the heart of this ultra-light dive watch is a homemade movement designed for both lightness and robustness, the UN-374, whose bridges are 90% recycled titanium. Weighing a staggering 7 grams, the UN-374 can run for 90 hours at a fully wound frequency of 3 Hz.

Based on the UN-372 from the Diver X Skeleton, the new UN-374 has been tweaked to maintain its structural stability while keeping weight as low as possible. The watch has even been tested to withstand shocks of up to 5000 Gs, which is impressive considering its light weight.

The movement does not have any full plates, minimizing the space taken up by a traditional baseplate. The structural bridges are just a few millimeters wide and support the transmission train, keyless mechanism, and automatic winding system.high quality replica watches

Some of the gears appear to almost float, as the skeletonized bridges take up very little space. Although thin, their titanium construction ensures reliable structural integrity.

The winding system is still a Magic Lever variant, a design that recalls the UN-32 movement from Lemania in the 1990s.

The barrel has been reconfigured as a more complex "flying" device. This system does not require an upper bridge (a very inspiring example of a flying barrel can be found in the Pratt Oval Tourbillon), which further reduces weight. replica Jacob and Co. watches

The regulating organ itself is very advanced: the balance wheel uses a silicon cage with an inertial weight, and the silicon balance spring uses a proprietary flat terminal curve - a system we previously covered in depth in the Freak Saga Part 3 story. The escapement itself is made of silicon.

The Diver Air's 44mm case is mainly made of titanium, but it has a multi-piece construction. The titanium middle case ensures that the watch is water-resistant to 200 meters and is matched with carbon composite case sides. These black components are made of 60% nylon and 40% carbon fiber.

Nylo is made from recycled fishing nets by French startup Fil&Fab. The graded carbon fiber diving bezel is also made from recycled carbon and features a marbled pattern. These upcycled and recycled materials are eye-catching, but the end result looks a bit bland overall, and the aesthetics of the case are not impressive. Zenith Chronomaster sport 160th anniversary editiona



Ulysse Nardin Diver [Air]

Ref. 3743-170-2A/0A

Diameter: 44 mm

Thickness: 14.7 mm

Material: Recycled titanium and carbon composite

Crystal: Sapphire

Water resistance: 200 meters

Movement: Cal. UN-374

Functions: Hours, minutes, seconds

Winding: Automatic

Frequency: 21,600 vibrations per hour (3 Hz)

Power reserve: 90 hours

Strap: Elastic fabric strap