Jaeger-LeCoultre Q137258J Master Ultra Thin Power Reserve Pink Gold Gradient Blue Dial Watch

Jaeger-LeCoultre Master Ultra Thin Power Reserve – Ref. Q137258J

The Jaeger-LeCoultre Master Ultra Thin Power Reserve Ref. Q137258J is a sophisticated dress watch that embodies both elegance and upgraded technical performance. Introduced in 2024, this 39 mm 18-carat pink gold model pairs a radiant midnight-blue gradient dial with refined indicators, delivering exceptional clarity and charm. With its ultra-thin profile, visible caseback, and generous 70-hour power reserve, this timepiece is crafted for those who appreciate class, balance, and craftsmanship.

Case Dimensions

The case is made of 18-carat pink gold, measuring 39.0 mm in diameter with a thickness of approximately 8.95 mm, a slim profile for its function and material. The water resistance is rated at 5 bar (≈ 50 meters), for everyday protection. The lugs are slightly elongated and more elegantly tapered than previous versions. The caseback is sapphire crystal, allowing view of the beautifully finished movement.

Dial Hands — Gradient Blue Sunray Finish

The dial features a deep midnight-blue sunray brushed gradient that becomes richer towards the edge. Elongated applied hour markers and dauphine hands with a mix of polished and satin finish provide excellent contrast against the blue backdrop. Balance and readability are central: the dial includes an opaline small seconds subdial at 6 o’clock, a date hand subdial on the right, and a power reserve indicator on the left with the “zero” level clearly marked in red—bringing both practicality and visual balance.

Movement — Calibre 938 / 938/1 Upgrades

Inside Q137258J is Jaeger-LeCoultre’s calibre 938 (or updated 938/1), a self-winding movement running at 4 Hz (28,800 vph). It features about 262–300 components, 39 jewels, and delivers a significant 70-hour power reserve—nearly double that of its predecessor. One key upgrade is the use of silicon parts (such as silicon escapement or associated components) and a redesigned mainspring barrel which together reduce friction and improve efficiency. The movement’s architecture is just under 5 mm thick (~4.9 mm), preserving the ultra-thin character of the collection.

Strap Wearability

Q137258J comes with a navy-blue alligator leather strap, harmonizing beautifully with the gradient blue dial. The lug width is 21 mm, with standard lengths of ~75 mm for the 12 o’clock side and ~120 mm for the 6 o’clock side—designed for comfortable wear across many wrist sizes. The buckle is a matching pink gold pin buckle, adding polish and continuity with the case.

Technical Specifications

• Reference: Q137258J
• Case Material: 18-carat pink gold
• Diameter: 39.0 mm
• Thickness: ~8.95 mm
• Water Resistance: 5 bar / 50 meters
• Dial: Gradient midnight-blue sunray with opaline subdials
• Hands Markers: Dauphine hands applied markers in pink gold, polished/satin finish
• Movement: Calibre 938 automatic; functions: hours, minutes, small seconds, date, power reserve
• Power Reserve: 70 hours
• Strap: Blue alligator leather, gold pin buckle

What Makes Q137258J Unique

• Enhanced power reserve: The jump from previous ~40-hour reserve to 70 hours is a major performance boost without increasing case thickness.
• Gradient blue dial: Adds depth and visual drama, varying tone from center to bezel. More striking than flat blue finish models.
• Pink gold case elegance: The warmth of gold contrasts beautifully with the blue, giving this model dress-watch appeal with a hint of luxury.
• Ultra thin calibre: The movement stays slim (~4.9 mm) despite upgraded power reserve and complications. It preserves the elegant profile.
• Symmetrical dial layout: The date, small seconds, and reserve indicators are arranged to maintain balance, with clear markers and red accent on the power reserve “empty” end.

Conclusion

The Jaeger-LeCoultre Master Ultra Thin Power Reserve Ref. Q137258J is an outstanding dress watch that offers upgraded mechanics, elegant aesthetics, and finely tuned details. With its rich gradient blue dial, extended power reserve, slim rose gold case, and balanced functionality, it stands out for those who appreciate subtle luxuries and enduring craftsmanship.