The Jaeger-LeCoultre Reference Guide: Reverso, Master Ultra Thin Moon, and Master Calendar Meteorite

Jaeger-LeCoultre occupies a position in haute horology that is difficult to describe without diminishing it. The manufacture has supplied movement calibres to Patek Philippe, Vacheron Constantin, Audemars Piguet, and IWC at various points across the twentieth century. The brand holds approximately 1,400 patents and has produced more than 1,200 distinct movement calibres since its founding in 1833. When other manufactures need a complication architecture they cannot solve internally, they go to JLC. And yet at the consumer level, Jaeger-LeCoultre operates as a quieter brand than its Geneva neighbours, with secondary market pricing that reflects this brand-awareness gap rather than the underlying horological substance.

For the pre-owned buyer in 2026, that gap is the opportunity. A Jaeger-LeCoultre Reverso in steel with hand-wound calibre 822 trades in the $5,000 to $6,500 band on the secondary market. A Master Ultra Thin Moon 39 in steel with the calibre 925 automatic moonphase trades around $7,500. A Master Calendar with meteorite dial trades around $10,750 to $11,250. These are not entry-level watches. They are watches with finishing, complication architecture, and movement engineering at a level most enthusiasts associate with significantly higher price bands.

This guide covers the Jaeger-LeCoultre references that matter on the pre-owned market in 2026: the Reverso family in its multiple configurations, the Master Ultra Thin Moon, and the Master Calendar with the meteorite dial that has become one of the more distinctive JLC dials in current production.

The Reverso: the watch that defined a category

The Reverso was designed in 1931 by César de Trey and Jacques-David LeCoultre to solve a specific problem. British Army officers stationed in India were playing polo and breaking the crystals of their wristwatches on the mallet. They asked for a watch that could be flipped over on the wrist to protect the dial during play. The Reverso (Latin for "I turn") was the engineering response: a rectangular case mounted on a swivel cradle that allowed the watch to rotate 180 degrees and lock with the solid caseback exposed.

Ninety-three years later, the swivel case remains the Reverso's defining feature. The rest of the watch has been refined across multiple generations, but the rotating case construction is unchanged from 1931. This is the longest continuous production of a single mechanical design feature in luxury watchmaking, and it is what makes the Reverso the most architecturally distinctive watch in haute horology.

Reference Q2708410 (Reverso Grande Taille)

The Reverso Grande Taille in steel with manual-wind calibre 822. Larger case proportions than the standard Classique (approximately 46mm by 27mm), silver guilloché dial, blued steel hands. The Grande Taille is the Reverso for collectors who want the historical proportions of the line in a contemporary wrist-conscious size. Honeyrock's mint full-set example trades at $6,450 with box and papers.

Reference Q2568403 (Reverso Duetto Classique)

The Duetto is the dual-face Reverso. The front dial displays the time conventionally. Rotating the case reveals a second dial on what would normally be the caseback, with a different time display (often a second time zone or a contrasting dial colour). The Duetto Classique 2568403 carries the calibre 854 manual wind. Honeyrock's example at $6,600 represents the dual-face Reverso at its most accessible.

Reference 273.2.85 (Grande Reverso Duo in Rose Gold)

The Reverso Duo in 18k rose gold with manual-wind calibre 854. Two faces, two time zones, rose gold case construction. This is the precious-metal Reverso for collectors who want the architectural distinction in a more formal context. Honeyrock's example trades at $20,750 with original Cartier-style presentation.

Reference Q2518412 (Reverso Classique with Bracelet)

The standard Reverso Classique in steel with both bracelet and leather strap variants. Calibre 657 manual wind. The Classique is the entry point into the Reverso line and the case proportion most universally associated with the brand. Pre-owned market position: $5,950 for full-set examples.

Reference 250.8.86 (Reverso Classique Manual Wind)

An earlier-generation Reverso Classique with manual wind movement. Same case architecture as the Q2518412 with minor dial and movement detail differences. Pre-owned: $4,890, which makes it the most accessible Reverso in current Honeyrock inventory.

Reference Q2518410 (Reverso Classique Monoface)

The Reverso Classique Monoface in steel with original bracelet and additional leather strap. The Monoface designation indicates a single time-display dial (the caseback is solid rather than carrying a second dial). 2013 full-set in mint condition with original bracelet at $5,950.

The Master Ultra Thin Moon 39: the dressy moonphase

The Master Ultra Thin Moon is JLC's slim-case dress watch with moonphase complication. 39mm round case in steel, calibre 925 automatic with date and moonphase displays, black sunburst dial. This is the JLC for collectors who want a dressy round watch with a complication that does something more than tell time.

Reference Q1368470 (multiple examples)

Honeyrock currently holds three examples of the Master Ultra Thin Moon 39 with black dial, all under the same Q1368470 reference but with different production years and conditions. Pre-owned market positions: $6,390 to $7,950 depending on box, papers, and condition. The 2017 full-set example trades at $7,490, the brand-new full-set example trades at $7,950, and the standalone example without complete papers trades at $6,390.

The calibre 925 inside this reference is one of JLC's more elegant moonphase movements. Bi-directional automatic winding, 28,800 vph, approximately 38-hour power reserve, and the moonphase complication accurate to within one day every 117 years (which is haute horology standard for the complication). The case at 39mm in steel reads as a dress watch under a cuff and sits at one of the most universally wearable proportions in the modern JLC range.

The Master Calendar Meteorite: the most distinctive JLC dial in production

The Master Calendar is JLC's triple calendar reference with moonphase complication. The dial displays the day, the month, and the moonphase in their respective subdials, with the date shown on a retrograde hand around the dial perimeter. The watch tells you what day, what month, and what moon phase. Setting it correctly each month is part of the ritual.

Reference Q1558421 (Master Calendar with Meteorite Dial)

The Master Calendar with the dial fashioned from a slice of Muonionalusta meteorite (a iron-nickel meteorite that fell in Sweden approximately one million years ago, discovered in 1906). The meteorite dial is cut and polished from a single piece of the meteorite, which means each dial has a different pattern of Widmanstätten crystallisation. No two Master Calendar Meteorite watches have the same dial.

This is the JLC for collectors who specifically want a watch that cannot be replicated. The dial pattern, the complication layout, and the case construction are all standard production. The meteorite slice is unique to each watch.

Honeyrock currently holds three Master Calendar Meteorite examples, all under the Q1558421 reference but with different production years and conditions:

• 2017 full-set in mint condition: $11,250
• 2017 full-set: $10,750
• Full-set in good condition: $10,890

The meteorite dial Master Calendar has become one of the more sought-after JLC references on the secondary market over the past three years, particularly among collectors who prioritise dial originality over case material. The calibre 866 automatic inside provides the day, month, date, and moonphase displays with bi-directional automatic winding and 40-hour power reserve.

The Master Hometime: the dual-time JLC

Reference Q1628120 (Master Hometime GMT)

The Master Hometime is JLC's dual-time travel watch. Calibre 975 automatic with simultaneous display of two time zones (one on the main dial, the second on a 24-hour subdial at six o'clock), date complication, and approximately 48-hour power reserve. This is the JLC for collectors who want a travel watch in a Master-line case rather than a Reverso architecture.

Pre-owned market position: $6,150 for the example in Honeyrock's inventory. The Master Hometime is one of the more under-discussed JLC references and represents a value position relative to the Reverso Duo for buyers who want dual-time functionality in a more conventional round-cased dress watch.

What separates Jaeger-LeCoultre at the movement level

Three things distinguish JLC from its haute horology peers.

First, the manufacture is fully integrated. JLC produces every component of its movements in-house at the Vallée de Joux facility, from hairsprings to escapement components to dials. Very few luxury watchmakers maintain this level of vertical integration. Patek Philippe produces most components in-house but sources some specialised parts externally. Audemars Piguet produces case components and finishes movements but historically sourced some calibre architectures from movement specialists. JLC produces everything.

Second, the movement calibre library is the deepest in the industry. JLC has produced more than 1,200 distinct calibres since 1833, ranging from the slim calibre 849 (used in the Master Ultra Thin line) to the complex calibre 945 (used in the Hybris Mechanica grand complications). For comparison, Patek Philippe has produced approximately 200 distinct calibres. The JLC depth allows the brand to develop specialised movement solutions for complications that other manufactures must compromise on.

Third, the brand's relationship with the wider haute horology industry is unusual. JLC has historically supplied movement calibres to Patek Philippe, Vacheron Constantin, Audemars Piguet, IWC, and several smaller independent watchmakers. The JLC calibre 920 became the base for the Patek Philippe 28-255, the Vacheron Constantin 1120, and the Audemars Piguet 2120 (which was used in the Royal Oak 5402). This historical role as movement supplier means a JLC purchase is buying into the engineering substrate that other haute horology brands have built upon.

Which Jaeger-LeCoultre to buy

The decision depends on what the JLC is for.

For a buyer who wants the most architecturally distinctive JLC, the Reverso family is the answer. The swivel case construction is unique to the line and represents the brand's most recognisable design. The Reverso Classique Manual Wind (250.8.86 or Q2518412) is the entry point. The Reverso Grande Taille (Q2708410) is the larger proportion for buyers who want more wrist presence. The Reverso Duo or Duetto is the dual-face expression for buyers who want a second time zone or contrasting dial colour on the reverse. The Grande Reverso Duo in rose gold (273.2.85) is the precious-metal flagship of the line.

For a buyer who wants a dress watch with a complication that goes beyond time, the Master Ultra Thin Moon 39 (Q1368470) is the most defensible choice. 39mm case, moonphase, date, and a calibre 925 that delivers technical substance at a price band below most competing moonphase references.

For a buyer who wants a JLC that cannot be replicated, the Master Calendar Meteorite (Q1558421) is the answer. The dial is unique to each watch and the triple calendar complication delivers a watch that requires monthly attention from its owner.

For a buyer who wants a dual-time watch in a conventional round case, the Master Hometime (Q1628120) is the under-discussed option at a price band well below comparable Patek or Rolex references.

What to inspect before buying a pre-owned Jaeger-LeCoultre

• Movement identification. Verify the calibre against the reference number. JLC produces multiple movement generations within each Reverso reference (calibre 822, 854, 657 are the most common manual-wind options) and the movement matters for service path and resale value.
• Reverso swivel mechanism. Test the rotation function carefully. The case should rotate smoothly through 180 degrees and lock in both positions. Any binding, sticky operation, or play in the swivel cradle indicates worn pivots and a service requirement. Reverso swivel service is a JLC-specific operation.
• Reverso reverse caseback. Verify the reverse face for engraving (some Reversos have engraved reverse, particularly limited editions and commemorative pieces). Original casebacks should match the front face condition.
• Moonphase function (Master Ultra Thin Moon and Master Calendar references). Verify the moonphase advances correctly through its cycle. Setting the moonphase requires reference to actual lunar position, so a misset moonphase is not necessarily a defect but the mechanism should function smoothly when set.
• Meteorite dial integrity (Master Calendar Q1558421). The meteorite dial can develop micro-cracks if subjected to thermal shock or impact. Inspect the dial under magnification for any surface irregularities, cracks, or detachment from the dial base.
• Service history. JLC movements want service every 5 to 7 years. JLC-serviced examples command a premium. A full JLC service runs approximately $700 to $1,200 depending on complication.
• Case finishing. The JLC case has crisp transitions between brushed and polished surfaces, particularly on the Reverso cradle and the Master line case sides. Over-polished examples lose these transitions.
• Bracelet or strap condition. Reverso bracelets show wear with use. Leather straps are consumables and should be priced accordingly.
• Box, papers, warranty card. Full-set examples command a 10 to 15 percent premium, and matter most on the Master Calendar Meteorite where authentication of the dial provenance adds resale value.

Further reading

• How to Buy a Pre-Owned Luxury Watch – the framework for inspection, authentication, and red flags before any pre-owned purchase.
• The Patek Philippe Calatrava 5196 and 5227 Deep Dive – the dress watch reference range that uses movement architecture historically supplied by JLC.
• The Vacheron Constantin Overseas Chronograph 49150 Deep Dive – the integrated sports chronograph from the brand that also historically used JLC calibre architectures.