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Longines HydroConquest 41mm Mens Watch Black Rubber
Ref. L37904569
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Stepping up in the same colour and case shape
A dive-oriented design built around a 41mm stainless steel case with a screw-down caseback and a protected screw-in crown. The unidirectional rotating bezel carries a black ceramic insert with a luminescent capsule, sitting above a sunray black dial dressed with applied Arabic numerals, baton markers, and silvered polished hands — all treated with Super-LumiNova. A 24-hour GMT hand works alongside a date window at three o'clock. The sapphire crystal has anti-reflective coating on both sides. Inside runs the automatic L844 calibre, beating at 25,200 vph with a 72-hour power reserve and a silicon balance-spring for enhanced magnetic resistance. The black rubber strap fastens with a double-security folding clasp incorporating a micro-adjustment system, and the watch is water-resistant to 300 metres.
- Reference
- L37904569
- Brand
- Longines
- Collection
- HydroConquest
- Case size
- 41mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- L844
- Functions
- Chronograph, GMT, Date
- Water resistance
- 300m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Goldsmiths
Additional specifications
- Power reserve
- 72 hours
- Origin
- Swiss made
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 (2,706), Automatic Watches (1,549), Chronograph Watches (1,029), Sports Watches (698), Dive Watches (491) and GMT Watches (208).
Temporarily out of stock
Goldsmiths is not currently taking orders for this reference. Last listed as available on 5 August 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
- 72-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
- Second time zone for travelling
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 | L37904569 | 129369 | R32154208 |
|---|---|---|---|
| Price | £2,650 | £3,000 | £2,500 |
| Case size | 41mm | 41mm | 42mm |
| Water resistance | 300m | 300m | 300m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Rubber strap | Stainless steel bracelet | Titanium bracelet |
| Power reserve | 72 hours | — | 80 hours |
| This watch |
| 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 72 hours fully wound — enough to sit off the wrist over a weekend and still be running.
Is it a men's or women's watch?
Listed as men's.
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