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Longines Legend Diver 39mm Mens Watch Blue
Ref. L37644909
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Stepping up in the same colour and case shape
The Legend Diver traces its proportions back to the 1959 reference 7042, and this 39mm version represents a deliberate step back from the 42mm models that preceded it — closer to the original in scale, and markedly better for it on most wrists. The dual-crown compressor geometry is retained, with the upper crown governing the internal rotating timing flange rather than an external bezel, which keeps the profile clean and the mechanism protected in a way that a conventional diver cannot match. At 12.7mm thick and 47mm lug to lug, the case sits lower and shorter than the rating of 300m might suggest: most watches built to that depth run considerably bulkier, and this one will disappear under a cuff. The blue lacquered dial is polished rather than matte, which means it shifts between a deep navy and something closer to midnight depending on the angle — a dial that earns a second look in changing light. Inside, the L888.6 runs a silicon balance spring, holds COSC chronometer certification, and carries 72 hours of reserve from a movement that beats at the unhurried rate of 25,200vph specifically to achieve it.
- Reference
- L37644909
- Brand
- Longines
- Collection
- Legend Diver
- Case size
- 39mm
- Case thickness
- 12.7mm
- Lug width
- 20mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- ETA A31.L11
- Functions
- Date
- Water resistance
- 300m
- Bracelet / strap
- Rubber strap
- Strap colour
- Blue
- Clasp
- Buckle
- Lume
- Luminous
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 47mm
- 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 the Longines Legend Diver range (15), Stainless Steel Watches (2,892), Automatic Watches (1,554), Blue Dial Watches (814), Sports Watches (708) and Dive Watches (495).
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What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 300m water resistance, rated for actual diving
- 39mm suits most wrists
- Sapphire crystal, which resists scratching
- 72-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
Longines Legend Diver alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | L37644909 | 171900000061 | R32223213 |
|---|---|---|---|
| Price | £2,850 | £2,995 | £2,200 |
| Case size | 39mm | 40mm | 39mm |
| Water resistance | 300m | 300m | 300m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Rubber strap | Rubber strap | Stainless steel bracelet |
| Power reserve | 72 hours | 38 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.
What size strap does it take?
20mm. 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.
Will it fit my wrist?
Lug-to-lug is 47mm, which suits wrists from roughly 16cm (6¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs it a men's or women's watch?
Listed as men's, though at 39mm it sits in the range that suits anyone.
Cheapest place to buy
Both Mappin & Webb and Goldsmiths list it at £2,850, so choose on delivery and warranty rather than price.
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