Jaeger-LeCoultre Master Ultra Thin Moon automatic copper dial alligator leather strap 39 mm

The Master Ultra Thin Heritage: Jaeger-LeCoultre’s Vision of Ultra-Slim Elegance

For more than a century, Jaeger-LeCoultre has explored the demanding art of ultra-thin calibres, a technical field in which the Manufacture in the Vallée de Joux distinguished itself very early on. As far back as the 1900s, it laid the foundations of this expertise before making history in 1907 with the celebrated calibre 145, nicknamed “Knife,” then the thinnest movement ever created. A feat that shaped the Maison’s aesthetic and technical identity and later inspired the birth, in 1993, of the Master Ultra Thin collection.

Designed to embody the quintessence of watchmaking elegance, this line relies on precise codes: pure lines, balanced proportions, an elongated profile, intentional sobriety, and an overall impression of refined discretion. The Master Ultra Thin stands as one of the finest expressions of Jaeger-LeCoultre’s philosophy, blending tradition, finesse, and mechanical excellence.

In this limited edition of 800 pieces, the Master Ultra Thin Moon introduces a new grained copper dial—warm, luminous, and subtly modernising the classical aesthetic of the collection. A delicate evolution that frames the moon-phase complication in an expression of finesse, balance, and sophistication.

A Grained Copper Dial with Warm and Poetic Charm

The central feature of this limited edition, the grained copper dial, offers a rare and instantly captivating visual depth. Jaeger-LeCoultre revisits the highly sought-after palette of modern salmon tones, enriching it with a matte, subtly textured surface that feels almost tactile. Under the light, the dial shifts between soft, powdery copper and deeper, more saturated reflections, recalling the warm nuances of the most coveted vintage timepieces.

For this Moon version, the balance of the dial is structured around a perfectly integrated circular subdial at 6 o’clock, where both the date display and the moon-phase indication meet. Framed by a smooth copper date ring, the complication takes on an almost architectural presence, merging contemporary minimalism with mechanical poetry.

At the centre of the subdial, the silver moon stands out against a deep blue starry sky, bringing a subtle touch of colour and a refined visual contrast. This ensemble, both understated and expressive, gives the dial a distinctive rhythm—balanced and never overloaded.

The elongated trapezoid hour markers and the dual-faceted Dauphine hands respond precisely to the matte texture of the background. As always with Jaeger-LeCoultre, one facet is satin-brushed and the other polished, creating a delicate play of light that enhances legibility while adding sophistication.

Finally, the minute track punctuated with small black dots adds a discreet graphic touch, while the overall composition retains an almost minimalist harmony. Rarely has a copper tone found such balance within a stainless steel case—a precious combination mastered by only a few great maisons, and one that Jaeger-LeCoultre elevates here with perfect control.

A Stainless Steel Case with Ideal Proportions

True to the refined aesthetic of the Master Ultra Thin line, this Moon version adopts a polished stainless steel case of great purity. Its 39 mm diameter is ideal for a contemporary dress watch: prominent enough to showcase the complication while remaining discreet and refined. With a thickness of 9.3 mm—slightly greater than the Date version due to the moon module—the watch retains a slender profile well suited to those seeking elegance and comfort.

The gently curved lugs—one of the collection’s hallmarks—provide a perfect fit on the wrist and enhance the fluidity of the case lines. The polished steel, bright and minimalist, forms a delicate contrast with the grained copper dial, subtly playing between cool reflections and warm tones.

This harmony naturally extends to the brown alligator strap created specifically for this edition. Its warm, deep colour complements the copper tones of the dial, forming a particularly coherent and sophisticated ensemble. Soft, elegant, and comfortable, it is equipped with a stainless steel folding clasp and an interchangeable system, allowing variations in style while preserving a strong identity.

A Harmonious and Perfectly Integrated Moon-Phase Complication

The poetic signature of this reference, the moon-phase complication occupies the centre of the subdial at 6 o’clock, where it shares space with a discreetly integrated date display. Jaeger-LeCoultre demonstrates here its mastery in combining two functions within a coherent, legible, and elegant layout without disrupting the balance of the dial.

The silver moon travels across a deep blue starry sky, adding a delicate touch of colour to the grained copper dial. Its polished metal contrasts beautifully with the matte background, giving the whole composition a quasi-pictorial character. Under the light, the disc seems animated, reinforcing the natural poetry of this complication so cherished in traditional watchmaking.

Around this night sky, a perfectly smooth copper date ring hosts the printed numerals. A fine steel hand indicates the date with precision and discretion, never overshadowing the moon. This layout achieves remarkable visual balance: the eye naturally gravitates toward the complication while enjoying clear, intuitive readability.

The low placement of the subdial contributes to the distinctive vertical symmetry of the Master Ultra Thin line—a subtle aesthetic signature that reinforces the purity and modernity of the dial while allowing the moon’s poetry to take centre stage.

A complication executed with exceptional finesse, where every detail—textures, tones, typography—contributes to fluid legibility and undeniable charm. A perfect expression of Jaeger-LeCoultre’s horological sensibility.

The Calibre 925: Mechanical Poetry, Jaeger-LeCoultre Style

At the heart of this Master Ultra Thin Moon beats the Jaeger-LeCoultre calibre 925, an emblematic ultra-thin automatic movement of the Manufacture. Entirely designed, assembled, and decorated within the workshops of the Vallée de Joux, it reflects the Maison’s dedication to combining finesse, precision, and reliability in an elegant, controlled construction.

This latest generation of the 925 benefits from an optimised 70-hour power reserve, providing comfortable autonomy while preserving the thinness that defines the collection. Its balanced architecture integrates the moon-phase and date complications without unnecessary thickness, supporting the refined silhouette of the watch.

Visible through the sapphire caseback, the movement reveals the full decorative expertise of the Maison:

• finely bevelled bridges,
• blued screws,
• Côtes de Genève,
• and, above all, a 750/1000 rose gold openworked rotor offering a deeper view of the mechanism.

This nearly artisanal attention to every finish speaks to a rare level of refinement, where the beauty of the movement matches its precision.

Like all Jaeger-LeCoultre creations, the calibre 925 undergoes the 1,000-Hour Control, a unique industry protocol that tests the performance of the watch over several weeks—not only the movement, but the fully assembled timepiece. A guarantee of reliability and chronometric stability that strengthens the value of this limited edition.

A Rare Configuration, Already Sought-After by Collectors

With this copper-toned Master Ultra Thin Moon, Jaeger-LeCoultre presents one of the most refined and contemporary interpretations of its signature complication. The grained copper dial—between modern salmon and vintage warmth—offers rare visual depth, beautifully enhanced by the pure lines of the steel case. This chromatic combination, highly appreciated by connoisseurs and historically associated with certain iconic classics, remains one of the strongest aesthetic signatures when mastered by a great Maison.

Released as a limited edition of only 800 pieces, each watch bears the exclusivity of a “One of 800” creation, further elevating its appeal among enthusiasts. The harmony of the dial, the poetry of the silver moon, the finesse of the calibre 925, and the overall balance make this timepiece stand out through both its natural elegance and its rarity.

A creation destined to become one of the most coveted configurations in the Master Ultra Thin line—combining tradition, modernity, technical mastery, and timeless beauty exactly as collectors expect from Jaeger-LeCoultre.