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.