Jaeger-LeCoultre Master Ultra Thin Date – Ref. Q1238481
The Jaeger-LeCoultre Master Ultra Thin Date Ref. Q1238481 is a refined dress watch that embodies sophistication and understated elegance. With a sleek 39 mm stainless steel case, a sumptuous blue sunray dial, and automatic precision movement, it is designed for individuals who appreciate timeless style enriched with technical perfection.
Elegant Case & Slim Profile
This watch features a polished stainless steel case 39 mm in diameter and just 7.8 mm thick, giving it a graceful presence on the wrist that slips comfortably under a shirt cuff. Slightly rounded lugs and a moderately sized bezel give balance to the design, maintaining a sense of proportion and classic dress watch lineage. The sapphire crystal provides both clarity and durability.
Blue Sunray Dial & Distinctive Details
Beneath the crystal sits a radiant blue sunray dial, offering both depth and subtle play of light. Slender trapezoidal hour markers and dauphine hands are polished for elegance and filled with luminescent material for readability. A date display is neatly positioned at 6 o’clock, supporting overall symmetry. The design language is minimal, but every detail is meticulously finished to reflect Jaeger-LeCoultre’s fine watchmaking heritage.
Movement & Performance: Calibre 899
Powering the Q1238481 is Jaeger-LeCoultre’s in-house Calibre 899, an automatic movement renowned for its reliability and slim construction. It oscillates at 28,800 vph (4 Hz), contains 32 jewels, and delivers an impressive 70-hour power reserve. The movement’s finishing is visible through a transparent case back, showcasing Geneva stripes, polished bevels, and blue screws—hallmarks of traditional craftsmanship.
Water Resistance, Strap & Wearability
The Master Ultra Thin Date Q1238481 is water-resistant to 5 bar (≈ 50 meters), enough for everyday exposure to rain or splashes, though it is designed primarily as an elegant urban companion rather than a sport or diving tool. It comes with a high-quality alligator leather strap, fitted with a stainless steel folding buckle. Interchangeable strap compatibility adds versatility.
Key Specifications
- Reference: Q1238481
- Case: 39 mm stainless steel, 7.8 mm thickness
- Dial: Blue sunray, date at 6 o’clock
- Hands & Markers: Dauphine hands, trapezoidal indices with luminescent fill
- Movement: Calibre 899 automatic, 70-hour power reserve, 4 Hz
- Water Resistance: 50 m
- Strap: Alligator leather, stainless steel folding buckle
Why This Watch Is Unique
- Thin elegance: At just under 8 mm thick, it’s one of the thinner automatic watches in its class, offering comfort and dress watch appeal.
- Balanced design: The date at 6 o’clock, symmetric dial layout, and refined markers give a harmonious, classic look.
- Long power reserve: 70 hours ensures the watch remains reliable even if not worn daily.
- Visible craftsmanship: Transparent case back reveals beautifully finished movement components — nothing hidden.
Conclusion
The Jaeger-LeCoultre Master Ultra Thin Date Ref. Q1238481 is a distinguished timepiece for those who value subtle luxury. With its slim profile, elegant blue dial, enduring Calibre 899 movement, and classic aesthetics, it’s a superb choice for collectors and style-conscious individuals who appreciate precision, comfort, and timeless design.

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