Ulysse Nardin Diver X Skeleton Blue Review – Vivir

Name: Ulysse Nardin Diver X Skeleton Blue Review – Vivir
Item: Ulysse Nardin Diver X
Author: Rina Park

The Ulysse Nardin Diver X Skeleton Blue (ref. 3723-170LE-3A-BLUE/3A) is not your everyday dive watch. It’s a statement piece for the collector who wants the ruggedness of a 300m water-resistant tool watch but refuses to sacrifice visual drama. With a fully skeletonized UN-372 movement visible through the sapphire caseback and a blue dial that plays with light like a deep-sea trench, this limited edition bridges the gap between horological artistry and real-world adventure.

Released as part of Ulysse Nardin’s Diver X collection, this reference leans into the brand’s maritime heritage while embracing modern skeletonization. The titanium case keeps it light on the wrist, and the rubber strap ensures it stays put whether you’re diving the Great Barrier Reef or just diving into a boardroom. It’s a watch that demands attention without shouting – the kind of piece that gets noticed by people who know what they’re looking at.

For the young, culture-forward collector who values both provenance and presence, the Diver X Skeleton Blue is a rare intersection of form and function. It’s not a safe choice – and that’s exactly the point.

Manufacture History

Ulysse Nardin was founded in 1846 in Le Locle, Switzerland, and quickly became a leader in marine chronometry, supplying precision timepieces to navies worldwide. Today, the brand is known for pushing boundaries with avant-garde designs like the Freak and the Diver X, while maintaining a deep respect for its nautical roots.

Movement

The UN-372 is a fully skeletonized in-house caliber with a silicon escapement and a 4-day power reserve. The bridges are hand-finished with Geneva stripes, and the openworked architecture reveals the mainspring barrel and gear train in a way that feels almost architectural. It’s COSC-certified, beating at 28,800 vph with 31 jewels, and includes a date complication at 6 o’clock.

Specifications

Case: 44mm titanium
Thickness: 14.5mm
Lug-to-lug: 50mm
Crystal: Sapphire
Water resistance: 300m
Lume: Super-LumiNova
Strap: Rubber with pin buckle

Wrist Feel

The 44mm titanium case is surprisingly light – you’ll forget you’re wearing a dive watch until you catch a glimpse of that skeletonized dial. The rubber strap is supple and conforms to the wrist immediately, and the pin buckle keeps everything secure without adding bulk. The balance is excellent, thanks to the lightweight case material and the low center of gravity from the movement.

On a 7-inch wrist, the Diver X Skeleton Blue wears larger than its dimensions suggest because of the open dial and the prominent crown guards. But the short lug-to-lug (50mm) means it doesn’t overhang, and the curved lugs hug the wrist nicely. It’s a watch that feels substantial without being heavy – perfect for all-day wear, whether you’re in a wetsuit or a suit.

Accuracy

COSC-certified to -4/+6 seconds per day, the UN-372 movement consistently performs within spec. In real-world wear, expect around +2 to +4 seconds per day, thanks to the silicon hairspring’s resistance to magnetism and temperature changes. The 96-hour power reserve means you can take it off for a weekend and still have it running on Monday.

Occasions

This watch is built for sport, daily wear, and travel. Its 300m water resistance makes it a legitimate dive tool, while the skeletonized dial ensures it stands out at a cocktail party. It’s not a dress watch, but it can easily dress up with a leather strap swap.

Wrist Presence

4/5 – The skeletonized dial and blue accents make it impossible to ignore, but the titanium case keeps it from feeling ostentatious. It’s a conversation starter without being a peacock.

Reference Variants

Other limited-edition Diver X Skeleton models include the black PVD-coated version (ref. 3723-170LE-3A-BLACK/3A) and the white dial variant (ref. 3723-170LE-3A-WHITE/3A). All share the same UN-372 movement and titanium case construction.

Similar Watches

If you like the Diver X Skeleton Blue, consider the Omega Seamaster Diver 300M Skeleton, the Hublot Big Bang Unico Skeleton, or the Zenith Defy Classic Skeleton. Each offers a different take on the skeletonized dive watch concept.

Investment Value

With an MSRP of $12,500 and pre-owned prices ranging from $8,000 to $10,500, the Diver X Skeleton Blue holds its value well. As a limited edition, it’s a solid hold for collectors who appreciate independent watchmaking and skeletonized movements.

Service Interval

Ulysse Nardin recommends a service every 5 years, costing approximately $800. Due to the complexity of the skeletonized movement and silicon components, service should only be performed by an authorized center.

Pros and Cons

Pros: Stunning skeletonized dial, lightweight titanium, 300m water resistance, 96-hour power reserve, limited edition exclusivity.

Cons: 44mm may be too large for some, skeleton dial can be hard to read, rubber strap lacks quick-release, high price point.

Final Verdict

The Ulysse Nardin Diver X Skeleton Blue is a masterclass in blending horological artistry with real-world utility. It’s not for everyone – the skeletonized dial demands a certain confidence – but for the collector who wants a dive watch that stands out in a sea of black bezels, this is a rare gem. Light, tough, and visually arresting, it earns its place in any serious rotation.