Longines HydroConquest Updated — Now Also in 39 mm

When it comes to sports watches, there is one model type almost every established brand needs in its collection: a really good diver. For many brands it works as the very backbone of the range — robust, versatile, and clean enough to work both day to day and in dressier settings. For Longines, the HydroConquest is exactly that watch. Now the brand presents a comprehensive update of the series, where the design has been refined, the details improved, and — the big news for many enthusiasts — the model is now offered in 39 mm.

A modern take on Longines’ sporty heritage

The HydroConquest was first introduced in 2007 and quickly became Longines’ answer to the demand for a robust diver with the brand’s characteristic elegance. The mix of sporty functionality and relatively discreet design made it a popular entry-level diver in the Swiss segment. Since then the model has evolved step by step — ceramic bezels arrived in later generations, and the design has gradually become more modern without losing the link to Longines’ classic style. The 2026 version continues on the same path. The update is not about changing everything, but rather about refining and improving the details — this is, in effect, the third generation and its biggest update in nearly twenty years.

39 mm — big news for enthusiasts

One of the most interesting changes is the size. The new generation HydroConquest is now offered in two sizes: 39 mm and 42 mm, both in a slim 11.7 mm profile with shorter lug-to-lug than before. For many enthusiasts 39 mm is something of a sweet spot. The size gives a more classic proportion on the wrist and works for considerably more wrist sizes than the larger sports models that have dominated the market for years. It is also a clear industry trend right now, with several brands returning to more balanced dimensions. That Longines chooses to offer the HydroConquest in 39 mm makes the model considerably more attractive to many collectors — especially anyone who appreciates a sports watch that still feels elegant.

New dials and ceramic bezels

The updated model introduces several new dials and colour combinations. The collection is now offered with blue, black, and green lacquered dials, all with applied indices treated with Super-LumiNova for good legibility even in the dark. Beyond these there is also a more special variant with a frosted blue sunray dial that creates an interesting play of light across the surface. The dial layout itself has been streamlined too: the large Arabic numerals that long defined the HydroConquest give way to geometric applied markers mirroring the HydroConquest GMT, for a more balanced look.

The bezel remains ceramic and comes in several colours: black, blue, slate grey, green, and a lighter blue tone. The ceramic bezel has also been reworked and draws inspiration from the Longines Ultra-Chron Diver, which should give a more distinct and tactile feel when you turn it. At 12 o’clock on the bezel there is also a Super-LumiNova capsule so the zero marker stands out clearly even in low light.

A diver built for everyday and adventure

Technically, the HydroConquest remains a serious diver. The steel case has a screw-down crown and handles 300 metres of water resistance, placing the model in the same category as many of the market’s most established divers. Under the hood sits Longines’ automatic calibre L888.5 — an exclusive ETA-based movement (built on the 2892) running at 25,200 vibrations per hour with 21 jewels. It uses a silicon balance spring, which improves resistance to magnetism — something that has become increasingly important in today’s tech-filled daily life — and offers a power reserve of up to 72 hours, meaning the watch can sit over a whole weekend without stopping.

New bracelets — including Milanese mesh

Another piece of news in the collection is the updated bracelets. The classic steel bracelet has gained H-shaped links and a clasp with micro-adjustment, making it easier to fine-tune the fit. But perhaps most interesting is that the HydroConquest is for the first time offered with a Milanese mesh bracelet. The brushed mesh design gives the watch a more retro-inspired feel and is at the same time comfortable and breathable on the wrist. This option gives the model a slightly more elegant profile and shows how the HydroConquest can move between sport and dressier settings.

A brief word on Henry Cavill

The launch of the new generation HydroConquest comes in a campaign with Henry Cavill, who has been a Longines ambassador since 2024. The campaign was shot on Tenerife’s dramatic volcanic beaches, where the meeting of land and sea mirrors the watch’s identity. The idea is to show the model as a companion for both adventure and everyday life — a balance between function and elegance that Longines has long worked with.

An important model for Longines

Every big watch brand needs a really strong diver in its collection. For some brands it is models like the Submariner, Seamaster, or Black Bay that define the segment. For Longines, the HydroConquest fills a similar role. It represents the brand’s sporty side while keeping the elegance the brand has always been known for. The new generation does not change the concept — but it makes the model sharper, more modern, and more relevant, not least thanks to the 39 mm size. Pricing stays highly competitive at around USD 2,200 on the H-link bracelet and USD 2,400 on the Milanese mesh. That makes the HydroConquest an even more interesting candidate for anyone after a versatile Swiss diver that works as well day to day as in more active settings. For the limited-edition version of this generation, see our look at the Longines HydroConquest Commonwealth Games 2026.