Adding a moon phase to the 39mm Ultra Thin Master platform, the Jaeger-LeCoultre Master Ultra Thin Moon 39 reference Q1368470 brings celestial tracking to a dress watch case, and this JLC Master Ultra Thin replica copies that configuration. The black dial provides high contrast for the moon phase aperture at six o’clock, where a gold moon disc moves against a dark sky backdrop. Dauphine hands and applied indices keep the rest of the face minimal, letting the complication speak for itself. At 39mm in stainless steel the proportions stay conservative, which suits the formal intent of this layout.

Technical Overview

• Reference: Q1368470
• Case diameter: 39mm
• Case material: stainless steel
• Dial: black with moon phase at six o’clock
• Crystal: sapphire with anti-reflective coating
• Functions: hours, minutes, seconds, date, moon phase
• Movement: clone Cal. 925/1, automatic, 28,800 vph
• Strap: black leather

Moon phase complications of this type run on a 59-tooth wheel that the movement advances by one tooth every 24 hours, so a full turn of the wheel covers two lunar months of 29.5 days each. The real synodic month is 29.53 days, which is why the display slips by about one day every two and a half years and needs correcting roughly that often.

Inside the Movement

The clone Cal. 925/1 driving this Q1368470 handles the date and the moon phase off a single gear train extension, beats at 28,800 vph and holds 42 hours of reserve where the genuine Cal. 925/1 holds 45. Moon phase is one of the oldest horological complications, predating the chronograph by centuries, and Jaeger-LeCoultre has offered it in various forms since the early twentieth century. On a black dial the gold moon disc creates a striking visual focal point that darker strap choices amplify even further. Jaeger-LeCoultre fits the moon phase and date work of this movement into 4.9 mm of height, and the thickness of the case follows from that number. Two 39mm Moon references sit next to each other in this catalogue and are easy to confuse: Q1368470 is the black-dial version and Q1368430 the silver sunray one, so the reference number is the only reliable way to tell which Master Ultra Thin Moon replica you are looking at. Both carry the same clone Cal. 925/1 and the same 50 m water resistance as the genuine watches. For more options within this range, visit our Ultra Thin Master collection. The 1362511 time-only reference shares the same 39mm case but drops the moon phase, which may suit anyone who prefers a cleaner dial.

What Sets It Apart

The case measures 39 mm across and 9.9 mm from caseback to crystal, which is the number that matters on a watch sold on thinness rather than on dial size. The black dial amplifies the visual effect of the complication: the gold disc sits against a dark ground, so the aperture is the first thing the eye lands on. This Master Ultra Thin super clone puts a centuries-old complication into a genuinely slim modern package.

Black is the highest-contrast setting this complication gets, while the rest of the 39mm Ultra Thin Master line offers the same case with lighter dials and other indications. Read the moon phase section of our JLC guide to see how the Q1368470 is graded against the calendars and tourbillons above it.

Specifications

• Model: Jaeger-LeCoultre Master Ultra Thin Moon 39
• Reference: Q1368470
• Case: stainless steel
• Case size: 39 mm diameter, 9.9 mm thick
• Dial: black, moon phase aperture at 6 o’clock, applied indices, dauphine hands
• Complications: date, moon phase
• Movement: clone Cal. 925/1, automatic, 28,800 vph
• Power reserve: 42 hours (genuine Cal. 925/1: 45 hours)
• Water resistance: 50 m (same as genuine)
• Crystal: sapphire with anti-reflective coating
• Strap: black leather with pin buckle