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Longines Master Collection Automatic 39mm Mens Watch Blue
Ref. L29494932
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Stepping up in the same colour and case shape
The Master Collection has always occupied a specific place in Longines' catalogue: dress watches built around in-house-grade movements, kept slim enough to disappear beneath a cuff. This 39mm example does exactly that. At 9.4mm thick with a 46.1mm lug-to-lug span, it sits flat against the wrist and clears a shirt sleeve without bulk — proportions that take genuine engineering to achieve at this level of finishing. The L888.5 is where the case thinness earns its keep. Built on the ETA A31.L11 architecture but upgraded with a silicon balance-spring, it runs at 25,200 vph, resists magnetic interference that would trouble a conventional hairspring, and stores 72 hours of power reserve — enough to survive a long weekend off the wrist without resetting. The barleycorn-textured blue dial shifts from deep navy to something closer to steel depending on the angle of the light, with white Arabic numerals and leaf-shaped hands that keep legibility clean regardless of that movement. The alligator strap carries a triple-safety folding clasp with a micro-adjustment system — not an afterthought mechanism, but one that allows the fit to be dialled in precisely as the leather beds in over time.
- Reference
- L29494932
- Brand
- Longines
- Collection
- Master Collection
- Case size
- 39mm
- Case thickness
- 9.4mm
- Lug width
- 20mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- ETA A31.L11
- Functions
- Date
- Water resistance
- 30m
- Bracelet / strap
- Leather strap
- Strap colour
- Blue
- Clasp
- Folding clasp
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 46.1mm
- 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 5 collections
This watch appears in Stainless Steel Watches (2,366), Automatic Watches (1,159), Leather Strap Watches (743), Blue Dial Watches (628) and Dress Watches (342).
Manufacturer’s guarantee
What the specifications mean
A slim watch on leather, made for wearing with a shirt.
Strengths
- 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
- Sits in the lower half of Longines's range as we list it
Worth knowing
- 30m means keeping it away from water
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | L29494932 |  01 782 7811 4055-07 6 |  R27057732 |
|---|---|---|---|
| Price | £2,250 | £2,250 | £2,250 |
| Case size | 39mm | 39.5mm | 40mm |
| Water resistance | 30m | 30m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Leather strap | Ceramic bracelet |
| Power reserve | 72 hours | 41 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?
No. At 30m it will survive rain and handwashing, but not submersion of any kind.
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?
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 46.1mm, which suits wrists from roughly 16cm (6¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is 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
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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