Jaeger-LeCoultre Master Ultra Thin Moon 39 mm – Ref. Q1362503
The Jaeger-LeCoultre Master Ultra Thin Moon Ref. Q1362503 exemplifies elegance and precision in one beautifully balanced luxury timepiece. Crafted in 18-carat rose gold, featuring a diamond-set bezel and moon-phase complication, this 39 mm piece offers both visual splendour and technical refinement. Ideal for connoisseurs who value subtle opulence, excellent craftsmanship, and dependable performance.
Case & Dimensions
The case is forged from 18-carat rose gold (750/1000), measuring 39 mm in diameter with a thickness of approximately 9.3 mm. This gives the watch a strong wrist presence while retaining a slim, wearer-friendly profile consistent with the “Ultra Thin” designation. Water resistance is rated at 5 bar (50 meters), enough for daily protection from splashes and brief, incidental contact with water.
Diamond Bezel & Design Details
Surrounding the dial is a bezel set with 60 brilliant-cut diamonds (~0.85 carats), lending sparkle that elevates the design from simple elegance to luxurious statement. The eggshell beige dial contrasts gently with the rose gold bezel, while dauphine hands add a touch of classic refinement. Applied gilt hour markers bring clarity and shine, letting the dial play beautifully in various lighting.
Movement & Technical Features – Calibre 925
Inside sits the automatic Calibre 925, a mechanical self-winding movement comprising 245 components, beating at 4 Hz (28,800 vibrations per hour), with 30 jewels. Its power reserve is a generous 70 hours, giving the wearer excellent reliability. The calibre also benefits from technical upgrades such as a new barrel, an escapement wheel, and a silicon anchor—elements contributing to improved efficiency and precision. The movement’s thickness is ~4.9 mm, helping the watch maintain its slender feel.
Dial & Moon-Phase Display
The dial is rendered in a warm eggshell beige tone, creating a soft, luxurious backdrop for the moon-phase display positioned at 6 o’clock alongside a date indicator. Moon and stars motif are refined, adding poetic character to timekeeping. Seconds hand sweeps with precision, hour and minute hands are dauphine style, and the hour markers are gilt and applied, offering both contrast and elegance.
Strap, Buckle & Wearability
The Q1362503 comes fitted with a black alligator leather strap, fastened via a rose gold pin buckle that matches the case. Strap lengths are standard (≈ 75 mm at the 12 o’clock side, ≈ 120 mm at the 6 o’clock side) with a lug width of 21 mm. The strap is interchangeable, letting you adjust the style while keeping the luxury feel. The combination of rose gold, diamond bezel, and a fine leather strap produces versatility—suitable for formal settings or elevating everyday attire.
Key Technical Specifications
- Reference: Q1362503
- Case Material: 18-carat rose gold
- Case Diameter: 39 mm
- Thickness: ~9.3 mm
- Water Resistance: 5 bar / 50 m
- Dial: Eggshell beige
- Hands & Markers: Dauphine hands, gilt applied hour markers
- Movement: Calibre 925 automatic — hours, minutes, seconds, date, moon-phase
- Power Reserve: 70 hours
- Bezel: Diamond-set (60 diamonds ~0.85 ct)
- Strap: Black alligator leather, pin buckle, 21 mm lug width, interchangeable
What Makes Q1362503 Unique
- The diamond bezel in rose gold transforms a classic moon-phase dress watch into a piece that captures attention while retaining elegance.
- Upgraded movement features (silicon anchor, new barrel, improved escapement) enhance reliability and precision—rare details in this category.
- The 70-hour power reserve ensures running capability over several days without winding, offering both luxury and practicality.
- Slim yet bold: 39 mm diameter with 9.3 mm thickness allows balance between presence and dress-watch wearability.
- Warm dial tones with eggshell beige, contrasted with rose gold and diamonds, deliver a refined and luxurious aesthetic.
Conclusion Q1362503
The Jaeger-LeCoultre Master Ultra Thin Moon Ref. Q1362503 is a showcase of haute horlogerie refined for everyday luxury. With its rose gold case, diamond bezel, upgraded Calibre 925 movement, moon-phase complication, and elevated finishing, this timepiece offers both beauty and performance. A choice for those who appreciate subtle sophistication, rare details, and enduring craftsmanship.

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