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Jaeger-LeCoultre Master Ultra Thin Moon 39mm Automatic Mens Watch
Ref. Q1362501
Sits in Jaeger-LeCoultre’s upper tier here — more premium than three quarters of the Jaeger-LeCoultre watches we list, which start at £5,650.
Price range £5,650 to £21,495 across 17 Jaeger-LeCoultre watches in stock.The Master Ultra Thin line has always been built around a single discipline: doing a great deal within almost no space. At 9.85mm, the Calibre 925 inside this watch has been finished with Côtes de Genève striping and blued screws, then subjected to Jaeger-LeCoultre's 1000 Hours Control — 42 days of testing across chronometry, water resistance and mechanical reliability — before leaving the manufacture. A moonphase complication at this thickness is not a given, and the date sub-dial that frames it on the ivory dial is integrated rather than appended. Where this reference departs from the plainer members of the family is the bezel: 80 brilliant-cut diamonds set into the rose gold case give it a character the unset version deliberately withholds. The strap is alligator, supplied by Camille Fornet, and the buckle is solid 18-carat rose gold — details that become apparent when the watch is off the wrist. At 39mm and under 10mm, it disappears beneath a cuff with nothing to snag, which is precisely the condition a dial this considered deserves to be seen in.
- Reference
- Q1362501
- Brand
- Jaeger-LeCoultre
- Collection
- Master
- Case size
- 39mm
- Case thickness
- 9.85mm
- Lug width
- 21mm
- Case material
- Rose gold
- Case shape
- Round
- Dial
- Ivory
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- JLC 925
- Functions
- Date, Moonphase
- Water resistance
- 50m
- Bracelet / strap
- Leather strap
- Strap colour
- Black
- Clasp
- Buckle
- Lume
- Luminous
- Condition
- Ex-display
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 46mm
- Power reserve
- 43 hours
- Gem set
- Yes
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 6 collections
This watch appears in Back in Stock (4,847), Automatic Watches (1,736), Leather Strap Watches (1,049), Dress Watches (546), Pre-Owned, Ex-Display & Vintage Watches (344) and Champagne & Cream Dial Watches (180).
Best of 2 retailers
What the specifications mean
A slim watch on leather, made for wearing with a shirt.
Strengths
- 39mm suits most wrists
- 46mm lug-to-lug keeps the 39mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- One of Jaeger-LeCoultre's more premium watches
Worth knowing
- 50m suits rain and handwashing, not swimming
Jaeger-LeCoultre Master Ultra Thin Moon alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | Q1362501 | LONGITUDE-WG-R-S | 102714 |
|---|---|---|---|
| Price | £16,050 | £17,325 | £17,325 |
| Case size | 39mm | 40mm | 40mm |
| Water resistance | 50m | 50m | 30m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Leather strap | Leather strap |
| Power reserve | 43 hours | — | 65 hours |
| This watch | Closely matched |
|
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.
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 43 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
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 46mm, 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 £16,050, so choose on delivery and warranty rather than price.
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