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Longines HydroConquest 44mm Mens Watch Blue
Ref. L38414966
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Stepping up in the same colour and case shape
The HydroConquest sits in Longines' Sport Collection as the brand's answer to a specific brief: a proper tool diver that does not look like it came from a dive-equipment catalogue. The larger of the two available case sizes, it makes no apology for presence on the wrist, though at 11.9mm thick it avoids the stacked profile that afflicts many watches rated to this depth, and will clear a shirt cuff more readily than the numbers might suggest. The L888 at the heart of it is a finely finished derivative of the ETA 2892, one of the more respected automatic platforms in Swiss production — running at 25,200 vph with a 64-hour power reserve, which means a watch left off the wrist on Friday morning is still running on Sunday evening. The sunray blue dial shifts from near-navy in shadow to a brighter, more saturated tone in direct light, and the snowflake hands — a HydroConquest signature — pick up the Super-LumiNova well enough to be genuinely useful at depth rather than merely decorative after dark.
- Reference
- L38414966
- Brand
- Longines
- Collection
- HydroConquest
- Case size
- 44mm
- Case thickness
- 11.9mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- ETA 2892
- Functions
- Date
- Water resistance
- 300m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Deployant clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 64 hours
Learn more about Longines
Auguste Agassiz began trading watches in Saint-Imier in 1832, but the modern company dates from 1860, when his nephew Ernest Francillon built a factory in the meadows beside the Suze — the longines of the local dialect — and consolidated the scattered outworkers of the region under one roof.
Longines registered its winged hourglass in 1889. It is the oldest watch trademark still in continuous use.
The company's identity was built on precision and on timing things in public. It supplied chronographs for the first modern Olympic events it timed in 1896, timed the 1912 Federal Gymnastics Festival with a broken-wire mechanism accurate to a hundredth of a second, and developed the photo-finish camera and the quartz timing devices used across twentieth-century athletics.
Its aviation associations are equally deep. Longines instruments were carried by Charles Lindbergh across the Atlantic in 1927, and the Hour Angle watch, designed to Lindbergh's own specification to simplify longitude calculation, remains in the catalogue. Amelia Earhart and Howard Hughes both navigated by Longines.
The house was among the most decorated at nineteenth-century observatory trials, holding numerous precision records. Since joining the Swatch Group in 1983 it has occupied the accessible-heritage position: exclusive ETA-based movements, archive-driven designs through the Heritage line, and volume that makes it one of the group's most important brands.
- 1860
- Ernest Francillon builds the factory at Les Longines.
- 1889
- The winged hourglass is registered — the oldest watch trademark in use.
- 1912
- Broken-wire timing achieves hundredth-second accuracy.
- 1927
- Lindbergh crosses the Atlantic with Longines instruments.
- 1983
- Becomes part of the Swatch Group.
Also in 7 collections
This watch appears in the Longines HydroConquest range (42), Stainless Steel Watches (2,833), Automatic Watches (1,417), Watches 44mm and Over (810), Blue Dial Watches (780), Sports Watches (667) and Dive Watches (486).
Temporarily out of stock
Mappin & Webb is not currently taking orders for this reference. Last listed as available on 9 September 2026. Stock is checked nightly and this page updates when it returns.
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 300m water resistance, rated for actual diving
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- Sits in the lower half of Longines's range as we list it
Worth knowing
- 44mm sits at the larger end
Longines HydroConquest alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | L38414966 | H82555130 | 01 733 7789 4135-07 4 23 35FC |
|---|---|---|---|
| Price | £1,300 | £1,265 | £1,400 |
| Case size | 44mm | 43mm | 43.5mm |
| Water resistance | 300m | 300m | 300m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 64 hours | — | 38 hours |
| This watch | Closely matched | Closely matched |
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 300m it is rated for swimming, snorkelling and recreational diving.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 64 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
What size strap does it take?
22mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Is it a men's or women's watch?
Listed as men's.
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