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Jaeger-LeCoultre Master Ultra Thin Moon 39mm Stainless Steel
Ref. Q1368471
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Stepping up in Jaeger-LeCoultre's range
The Master Ultra Thin line has always pursued a single discipline: making a mechanical watch with complications disappear beneath a cuff. This iteration tightens that argument with a flat, sunray-brushed black dial — a deliberate departure from the dished dials of earlier versions — and the Calibre 925, a movement JLC puts through 1,000 hours of cased-up testing across six positions before it leaves the manufacture. At 9.3mm thick and 45.5mm lug to lug, the proportions are genuinely unusual for a watch carrying both a date and a moonphase. Most complications add bulk; this one does not, and the result sits flush against the wrist in a way that makes the case feel smaller than 39mm reads on paper. The rhodium-plated dauphine hands catch light differently depending on the angle, which is how the dial earns its legibility — there is no lume here, nor any need for it in context. The quick-release spring bars are a quiet addition that repays attention over time: swapping between straps without tools on a watch at this level of finishing is less common than it should be, and the deployant clasp carries the JLC stamp without drawing attention to itself.
- Reference
- Q1368471
- Brand
- Jaeger-LeCoultre
- Case size
- 39mm
- Case thickness
- 9.3mm
- Lug width
- 21mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- 925
- Functions
- Date, Moonphase
- Water resistance
- 50m
- Bracelet / strap
- Leather strap
- Strap colour
- Black
- Clasp
- Deployant clasp
- Lume
- Luminous
- Condition
- Pre-owned
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 45.5mm
- Power reserve
- 70 hours
- Strap
- Interchangeable
Learn more about Jaeger-LeCoultre
Antoine LeCoultre opened a workshop in Le Sentier in 1833 and set about solving a problem nobody else had: precise measurement. His Millionomètre of 1844 was the first instrument capable of measuring to a micron, and it let the Vallée de Joux move from skilled approximation to genuine precision.
The house became the movement supplier to the industry. Patek Philippe, Vacheron Constantin, Cartier, and Audemars Piguet all built watches on LeCoultre ébauches, and the manufacture has produced well over a thousand distinct calibres — an output no other house approaches. The partnership with the Parisian retailer Edmond Jaeger, formalised in the company name in 1937, gave it the Jaeger-LeCoultre it still carries.
Two products define it in the public mind. The Reverso of 1931 was designed so British Army officers in India could flip the case and protect the crystal during polo; the reversible case became one of the few genuinely original watch designs of the century. The Atmos clock, developed from 1928, runs on atmospheric temperature variation and needs no winding at all.
The Duoplan and the calibre 101 — still the smallest mechanical movement in series production, introduced in 1929 — sit alongside the gyrotourbillons and minute repeaters that keep the manufacture at the technical front.
Richemont has owned the house since 2000.
- 1833
- Antoine LeCoultre founds his workshop in Le Sentier.
- 1844
- The Millionomètre measures to the micron for the first time.
- 1929
- Calibre 101, the smallest mechanical movement, is introduced.
- 1931
- The Reverso launches with its flip case.
- 1937
- The Jaeger-LeCoultre name is formalised.
Also in 5 collections
This watch appears in Stainless Steel Watches (2,797), Automatic Watches (1,432), Leather Strap Watches (918), Dress Watches (446) and Pre-Owned, Ex-Display & Vintage Watches (250).
What the specifications mean
A slim watch on leather, made for wearing with a shirt.
Strengths
- 39mm suits most wrists
- 45.5mm lug-to-lug keeps the 39mm case wearable
- Sapphire crystal, which resists scratching
- 70-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
Worth knowing
- 50m suits rain and handwashing, not swimming
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification |  Q1368471 | 6224 1127 MMB | 18400205 |
|---|---|---|---|
| Price | £8,950 | £9,950 | £6,960 |
| Case size | 39mm | 38mm | 39.5mm |
| Water resistance | 50m | 30m | 30m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 70 hours | 100 hours | 55 hours |
| This watch |
|
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Showering yes, swimming no. 50m covers splashes and brief immersion, but a swimming stroke generates well above the pressure that figure describes.
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 70 hours fully wound — enough to sit off the wrist over a weekend and still be running.
What size strap does it take?
21mm. 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 45.5mm, 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
Mappin & Webb at £8,950, pre-owned. No UK retailer we track lists this reference new.
Is this available new?
Not from the UK retailers we track. This reference is listed as pre-owned only, at £8,950 from Mappin & Webb. A pre-owned watch has been worn, and is normally sold under the retailer’s own warranty rather than the manufacturer’s.
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