By Brent Robillard
Which Longines dive watch is right for you?
Longines makes a lot of watches. Spend enough time with the brand’s catalogue and you can wander from aviation to horse racing, dress watches to chronographs, GMTs to high-frequency movements. But my own fascination with Longines started underwater.
The HydroConquest, Legend Diver, and Ultra-Chron Diver have each spent time on my wrist over the past few years. I’ve reviewed numerous versions of the first two, purchased a 39mm Legend Diver for myself, and finally got my hands on the Ultra-Chron after somehow managing to overlook it when it first appeared in 2022.
Having three dedicated divers in the stable is not out of place. But the fact that they are all so different is worth examining.
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All are serious dive watches. Yes. All offer 300 metres of water resistance. All have automatic Longines-exclusive movements with silicon balance springs. And all occupy that interesting territory where Longines has become particularly competitive: Swiss luxury watches that offer a lot for their asking price.
Beyond that, however, they offer diverse wrist experiences. So, which Longines dive watch is right for you?
Best Dive Watches Under $1,000
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A brief history of Longines dive watches
Longines’ history beneath the surface stretches back considerably further than any of its current dive-watch collections. In 1958, the company introduced the Nautilus Skin Diver ref. 6921, generally regarded as its first purpose-built dive watch. Produced in relatively small numbers, it featured a conventional external rotating bezel and a Compressor-style case supplied by Ervin Piquerez S.A. Just a year later came the ref. 7042, adopting the twin-crown Super Compressor architecture and internal rotating bezel that would eventually provide the blueprint for today’s Legend Diver.
By the end of the following decade, Longines was exploring another avenue entirely. The Ultra-Chron Diver, introduced in 1968, combined a substantial dive-watch case with the high-frequency calibre 431, running at 36,000 vibrations per hour. That unusual pairing of diving capability and high-beat mechanical timekeeping is the historical foundation of the modern Ultra-Chron.
Longines has revisited several of these designs over the years. The Heritage Skin Diver, introduced in 2018, brought the ref. 6921 back in modern 42mm form with 300 metres of water resistance, while the now-discontinued Heritage Diver 1967 incorporated a chronograph function—based upon an original reference from that year. Neither remains in the catalogue. Victims of a reorganization of the brand’s collections between 2022 and 2023.
That leaves three distinct Longines dive-watch families today: the HydroConquest, Legend Diver, and Ultra-Chron. Two draw directly upon important chapters in the company’s past, while the HydroConquest represents the contemporary branch of the family tree. All three are capable dive watches, but they arrive at the idea from very different directions.
Longines HydroConquest: the modern all-rounder
Long before its 2026 redesign, I commonly recommended the Longines HydroConquest. Usually, the question comes from someone looking to buy a first good Swiss mechanical watch. They want something from an established manufacturer. They want a watch they can swim with, travel with, wear to work, and probably own for the next couple of decades. And, understandably, they don’t want to spend a fortune figuring out whether mechanical watches are really for them.
The HydroConquest has always made sense. The redesigned 2026 collection makes an even stronger argument.
Available in 39mm and 42mm cases, the new HydroConquest abandons the large Arabic numerals of previous generations in favour of circular and baton markers, bringing it closer aesthetically to the excellent HydroConquest GMT. The result is cleaner and, to my eye, considerably more mature.
Longines also improved the bezel action, added a silicon balance spring to the L888.5, and offers both an updated H-link bracelet and an unusually well-executed fine mesh. Both bracelets get on-the-fly micro-adjustment.
The fundamentals remain suitably dive-watchy: 300 metres of water resistance, a screw-down crown and caseback, ceramic unidirectional bezel, sapphire crystal, and plenty of lume.
It is also the least expensive of these three watches by a considerable margin.
I contend that part of the recent enthusiasm surrounding the HydroConquest is tied to value. Watch enthusiasts have become accustomed to paying a certain amount for a Longines and receiving a certain level of quality in return. The latest HydroConquest feels as though it slips underneath that established equation.
The movement isn’t COSC-certified. There isn’t an exotic high-frequency calibre inside. Nor is there a particularly unusual historical story attached to its design.
Instead, you get a very good contemporary Swiss dive watch for $2,900 CAD on the H-link bracelet or $3,100 on mesh.
And I continue to favour the 39mm. At just 11.7mm thick, it wears perfectly on my 6¾-inch wrist. My pick would be the black dial with slate-grey bezel on mesh, or the blue on blue with H-link.
Who is the HydroConquest for?
Someone looking for a first Longines, a first luxury Swiss diver, or simply a versatile everyday sports watch.
It’s also the obvious choice for someone who values modern construction and price over historical provenance. If you’re going to own only one watch and expect it to do just about everything, the HydroConquest makes a compelling case.
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Longines Legend Diver: the heritage choice
Then there is the Longines Legend Diver. I’ll declare my bias immediately. As I say, I own one.
The design traces its lineage to the Longines ref. 7042 of 1959 and the Super Compressor cases manufactured by Ervin Piquerez S.A, mentioned above. Its two crowns and internal rotating timing bezel remain immediately recognizable more than six decades later—though it is no longer a true compressor.
That architecture also makes the Legend Diver look unlike most modern dive watches. There is no chunky external bezel. From across a room, you could mistake it for a slightly eccentric mid-century sports watch. Get closer and the diving credentials reveal themselves: dual screw-down crowns, an internally rotating timing scale, substantial lume, ISO 6425 certification, and 300 metres of water resistance.
The 39mm version is, again, my sweet spot. Though certain earlier models are still available in 42mm and others in 36mm.
Its L888.6 offers a 72-hour reserve, silicon balance spring, and COSC certification. The lack of a date restores the wonderful symmetry of the dial, while the box sapphire crystal retains much of the character of the original.
More recently, Longines has expanded the Legend Diver considerably. I’ve spent time with black, blue, terracotta, anthracite, green, and the excellent white-dial Legend Diver. There is now also the 42mm Legend Diver 59, which leans even more heavily into the historical character of the collection.
The Legend Diver’s greatest trick, however, may be how little it feels like a tool watch when you aren’t using it as one. I’ve worn mine casually, dressed up, travelling, and around the water. On a bracelet, it feels like a sports watch. Put it on leather and the same case suddenly becomes considerably dressier.
The HydroConquest looks like a dive watch. The Legend Diver can make you forget that it is one.
Who is the Legend Diver for?
The collector who wants history and versatility in equal measure. If you love vintage watches but want modern water resistance, chronometer certification, contemporary anti-magnetism, and a warranty, this is probably where I’d start.
It also makes considerable sense for someone who doesn’t necessarily want their dive watch to look like everybody else’s dive watch.
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Longines Ultra-Chron Diver: the enthusiast’s choice
Of these three watches, for me, the Ultra-Chron Diver is the brand’s sleeper hit. I had somehow never spent meaningful time with the modern Ultra-Chron until 2025, despite owning a vintage Longines Ultra-Chron ref. 8024 from 1969 and being fascinated by the company’s history with high-frequency movements.
Once I finally handled it, however, the appeal became considerably clearer.
At 43mm across and 13.9mm thick, this is easily the most substantial of the three. The cushion case helps contain its 49mm lug-to-lug measurement, but nobody will mistake the Ultra-Chron for a discreet watch.
That is part of the fun. The sapphire bezel has a depth and lustre that ceramic doesn’t quite replicate. The cushion case, red minute hand, textured dial, and seven-link bracelet lean heavily into late-1960s design, but it translates well today.
I should point out that Longines has also introduced the Ultra-Chron Carbon—a stealthy blacked out version that is quite attractive. It should be noted, though that it’s functionality as a dive watch is hindered by its fixed bezel.
Admittedly, the real reason to buy an Ultra-Chron may be for what’s on the inside.
The L836.6 operates at 36,000 vibrations per hour, or 5Hz. Longines has a genuine history with high-frequency watchmaking, including the calibre 431 found in the original 1968 Ultra-Chron Diver.
The modern movement continues that story and is certified as an “ultra-chronometer” by independent Geneva laboratory TimeLab. Rather than testing an uncased movement, TimeLab evaluates the assembled watch over 15 days at multiple temperatures under ISO 3159:2009.
The trade-off is a shorter 52-hour power reserve, compared with 72 hours for the other two watches.
For me, that’s an easy compromise to understand. Nobody buys a high-revving engine because they’re worried about fuel economy.
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Who is the Ultra-Chron Diver for?
The watch nerd. I mean that affectionately. And embrace it personally.
This is the choice for someone who already knows what 36,000 vph means and probably wants to tell you why it’s important. It is for the collector attracted to mechanical solutions, unusual movements, and watches with stories that extend beyond their external design.
It’s also the choice for someone who likes a larger watch. If the 39mm HydroConquest and Legend Diver represent the industry’s move toward smaller dimensions, the 43mm Ultra-Chron remains unapologetically substantial.
Three Longines divers, three approaches
What I find most interesting about comparing these watches is how little duplication exists between them.
The HydroConquest is the conventional modern dive watch. Ceramic bezel. Applied markers. Contemporary bracelets. 300 metres of water resistance. Straightforward, robust, and relatively affordable.
The Legend Diver reaches backwards. Its internal bezel, twin crowns, box crystal, and mid-century proportions connect it directly to one of Longines’ most recognizable historical dive watches.
And the Ultra-Chron Diver takes another branch of the company’s history entirely, building the watch around Longines’ experiments with high-frequency mechanical timekeeping.
Even their movements tell three different stories. The HydroConquest gets the dependable L888.5 with 72 hours of power reserve. The Legend Diver adds COSC certification with the L888.6. The Ultra-Chron sacrifices some reserve for the 5Hz L836.6 and its TimeLab ultra-chronometer certification.
None is objectively better. That’s precisely why Longines can sell all three.
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Which Longines dive watch should you buy?
If someone approached me today asking for a good Swiss dive watch at around $3,000 CAD, I’d still point toward the HydroConquest. It’s the value proposition of the group and probably the easiest watch here to recommend without knowing much about the person buying it.
If that person told me they loved vintage watches, I’d show them the Legend Diver. It has the strongest visual connection to Longines’ diving history and manages to be a legitimate 300-metre dive watch without looking particularly like a modern one.
And if they started talking about beat frequencies before I finished the question? Ultra-Chron.
For my own collection, I chose the Legend Diver. But that’s the irrational part of watch collecting creeping back into the conversation. I love its dial. I love the twin crowns. I love the internal bezel. And I love that its design remains so recognizable more than 65 years after the watch that inspired it first appeared.
Your answer may be different.
In fact, Longines is counting on it.
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About the author
Brent Robillard is a writer, educator, craftsman, and watch enthusiast. He is the author of four novels. You can follow him on Instagram.
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Ultra-Chron is overlooked and under-appreciated