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Longines HydroConquest 41mm Mens Watch Blue Rubber
Ref. L37904969
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Stepping up in the same colour and case shape
The HydroConquest has long occupied the practical end of Longines' catalogue — a proper diver's watch rather than a dressed-up one — and this GMT variant extends that brief to cover multiple time zones without softening the sporting character. The L844.5 at its heart is a flyer GMT, meaning the local hour hand jumps independently in one-hour steps rather than dragging the GMT hand with it: a small distinction that makes changing time zones on the move genuinely quick, and one that separates this calibre from the more common traveller's GMT. The silicon balance-spring gives it meaningful resistance to magnetic fields, and 72 hours of reserve means a long weekend away before it needs to be worn again. At 12.9mm thick, it sits flatter on the wrist than the 300-metre rating might suggest, and the integrated rubber strap — matched to the sunray blue dial and ceramic bezel — keeps it close to the arm rather than proud of it. The folding clasp has a built-in micro-adjustment, so fit in and out of a wetsuit can be dialled in without tools, which is where that kind of detail actually earns its place.
- Reference
- L37904969
- Brand
- Longines
- Collection
- HydroConquest
- Case size
- 41mm
- Case thickness
- 12.9mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Bezel
- Rotating
- Movement
- Automatic
- Calibre
- L844.5
- Functions
- GMT, Date
- Water resistance
- 300m
- Bracelet / strap
- Rubber strap
- Strap colour
- Blue
- Clasp
- Folding clasp
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Power reserve
- 72 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 6 collections
This watch appears in Stainless Steel Watches (2,351), Automatic Watches (1,148), Blue Dial Watches (624), Sports Watches (572), Dive Watches (388) and GMT Watches (143).
Manufacturer’s guarantee
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
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | L37904969 |  R32154208 |  SLA077J1 |
|---|---|---|---|
| Price | £2,650 | £2,500 | £2,580 |
| Case size | 41mm | 42mm | 42.6mm |
| Water resistance | 300m | 300m | 300m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Rubber strap | Titanium bracelet | Stainless steel bracelet |
| Power reserve | 72 hours | 80 hours | 50 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.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How 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.
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.
Cheapest place to buy
Goldsmiths is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
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