Jaeger-LeCoultre Q1248421 Master Ultra Thin Moon Stainless Steel Silver Dial Watch

Jaeger-LeCoultre Master Ultra Thin Moon 36 mm – Ref. Q1248421

Meet the Jaeger-LeCoultre Master Ultra Thin Moon Ref. Q1248421, a seamlessly elegant culmination of understated luxury and fine watchmaking craft. With its 36 mm stainless steel case, slim profile, and moon-phase complication, this timepiece bridges timeless design with modern wearability. Ideal for those who seek both sophistication and function in a dress-watch format.

Case, Build & Wearing Comfort

The case is crafted from stainless steel, 36 mm in diameter, with a thickness of approximately 9.344 mm—thin enough to slip under a cuff, yet substantial enough to be felt. Lugs are gently curved to conform to the wrist, and a sapphire crystal front (and display back) provides clarity and durability. Water resistance is rated at 5 bar (≈ 50 meters), offering protection from daily splashes and light moisture.

Dial & Hands – Aesthetic Refinement

The dial is a silvered-grey, sunray-brushed finish, offering depth and subtle texture. At 6 o’clock sits a moon phase display set against a deep midnight blue sky, complete with stars and a moon that lightly sparkle—the poetic complication that defines the Moon model. The central date pointer complements this display around the same aperture. Dauphine hands and rhodium-plated indices provide elegant contrast and readability, especially under soft lighting.

Movement & Technical Prowess

At its heart is the Calibre 925, an automatic movement that balances slim construction with reliable functionality. It delivers a power reserve of 70 hours, keeping you covered over the weekend without winding. The movement frequency is 4 Hz (28,800 vph), and the calibre’s thickness is about 4.9 mm, embodying JLC’s mastery of fine, thin movements. Functions include hours, minutes, central seconds, date, and moon phase.

Strap, Buckle & Finishing Touches

Paired with a black alligator leather strap, the watch offers both classic style and comfort. The strap is complemented by a stainless steel double-folding clasp for secure wear. Lugs measure 17 mm, and the standard strap lengths are approximately 65 mm on the 12 o’clock side, 105 mm on the 6 o’clock side, giving good fit for many wrist sizes. Additionally, the strap is interchangeable, enhancing versatility.

Key Specifications

• Reference: Q1248421
• Case Material: Stainless steel
• Diameter: 36 mm
• Thickness: ~9.344 mm
• Water Resistance: 5 bar / 50 m
• Dial: Silvered-grey sunray; moon phase display at 6 o’clock
• Hands & Markers: Dauphine hands, rhodium-plated indices
• Movement: Calibre 925 automatic; 70-hour power reserve
• Strap: Black alligator leather, double-folding buckle
• Lug Width: 17 mm

What Makes It Unique

• Moon-phase complication in refined form: While many watches with moon phases can be bulky, here it’s integrated elegantly in a slim, dress-friendly 36 mm steel case.
• 70-hour power reserve: More than a day’s wear, offering real practicality without sacrificing slimness.
• Exquisite dial treatment: The sunray finish reflects light beautifully, enhancing the silvered-grey tone without overwhelming.
• Versatile sizing: 36 mm is a versatile size—elegant on smaller wrists yet stylish for larger ones. Dressy yet wearable.

Conclusion

The Jaeger-LeCoultre Master Ultra Thin Moon Ref. Q1248421 is a masterclass in combining poetic complication with understated elegance. From its moon-phase window, rich finishings, generous 70-hour movement, and sleek 36 mm steel case, it conveys a luxury that doesn’t shout. It’s perfect for those who appreciate craftsmanship, heritage, and subtle style that endures.