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Jaeger-LeCoultre Reverso One Monoface 20mm Stainless Steel
Ref. Q3288420
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Stepping up in Jaeger-LeCoultre's range
The Reverso was conceived in 1931 for polo players who needed a watch face that could be turned away from harm, and the swivelling case has remained the collection's defining gesture ever since. The Monoface takes that mechanism and leaves the reverse blank — smooth steel, unadorned, waiting for an engraving that makes the watch particular to its owner. At 20mm wide and 7.9mm thick, this is the Reverso at its most intimate: a slender rectangle that disappears beneath a cuff and reads as jewellery against the wrist. The silvered sunray guilloché dial, blued steel hands and transferred Arabic numerals keep the art deco framing intact, while the diamond-set rows at the top and bottom of the bezel catch light without announcing themselves. The deep blue alligator strap, secured by a deployant clasp, gives the whole thing a precision of fit that a simple pin buckle would not — on a case this small, that matters.
- Reference
- Q3288420
- Brand
- Jaeger-LeCoultre
- Collection
- Reverso
- Case size
- 40.1mm
- Case thickness
- 7.9mm
- Lug width
- 14mm
- Case material
- Stainless steel
- Case shape
- Rectangular
- Dial
- Silver
- Crystal
- Sapphire
- Movement
- Quartz
- Calibre
- 657
- Water resistance
- 30m
- Bracelet / strap
- Leather strap
- Strap colour
- Blue
- Clasp
- Deployant clasp
- Lume
- Luminous
- Condition
- Pre-owned
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 40.1mm
- Origin
- Swiss made
- Warranty
- 2 years
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 (5,241), Stainless Steel Watches (3,391), Women's Watches (1,754), Leather Strap Watches (1,111), Silver Dial Watches (757) and Rectangular & Square Watches (492).
What the specifications mean
A slim watch on leather, made for wearing with a shirt.
Strengths
- 7.9mm is unusually slim for a 40.1mm case
- 40.1mm lug-to-lug keeps the 40.1mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- Sits in the lower half of Jaeger-LeCoultre's range as we list it
Worth knowing
- 30m means keeping it away from water
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.
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?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
Quartz, automatic and solar comparedWhat size strap does it take?
14mm. 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 40.1mm, which suits wrists from roughly 15cm (6 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 women's.
Cheapest place to buy
Mappin & Webb is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
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