Identified by reference Q1372510, the Jaeger-LeCoultre Master Ultra Thin Réserve de Marche is the power reserve model of the line, and this JLC Master Ultra Thin replica renders it in rose gold with an eggshell dial. The warm case tone pairs with a dial that uses applied gold indices and dauphine hands, creating a monochromatic look where metal and markers share the same color temperature. The dial carries three indications: a power reserve pointer at 10 o’clock, a radial date at 2 o’clock whose hand crosses a short printed arc of numerals, and a small seconds register at 6 o’clock. The dial is signed AUTOMATIQUE. That power reserve display is what gives the reference its Réserve de Marche name, and the time-and-date models built on the same case do not have it.

Technical Overview

• Reference: Q1372510
• Case material: rose gold
• Case size: 39 mm x 9.85 mm
• Dial: eggshell silvered, applied gold baton markers, AUTOMATIQUE signature
• Crystal: sapphire with anti-reflective coating
• Functions: hours, minutes, small seconds at 6, radial date at 2, power reserve indicator at 10
• Movement: clone Cal. 938, automatic, 28,800 vph
• Power reserve: 40 hours (genuine Cal. 938: 43 hours)
• Water resistance: 50 m (same as genuine)
• Strap: black alligator with pin buckle

The Q1372510 measures 39 mm across and 9.85 mm thick, the standard case for the Réserve de Marche. Rose gold is close to twice the density of stainless steel, so a gold example reads the same on paper as a steel one and still sits noticeably heavier on the wrist.

Inside the Movement

The genuine Réserve de Marche runs the automatic Cal. 938: 41 jewels, 28,800 vph, 26 mm across and 4.9 mm thick, rated at 43 hours. This Master Ultra Thin super clone carries a clone of that calibre, automatic at the same 28,800 vph, and holds 40 hours from a full wind. A slim rotor keeps the movement height down, which is what lets the case finish at 9.85 mm while driving three indications instead of one. Power reserve pointer, radial date and small seconds all draw on the single barrel, so the gauge at 10 o’clock reads the state of the mainspring that is actually running the watch. Visit our Ultra Thin Master collection for additional references. A different complication in the same warm metal sits on the 1362511 reference, a rose gold Master Ultra Thin Moon running a clone Cal. 925/1, where a moon disc and a date ring take the place of the power reserve sector.

What Sets It Apart

Gold dress watches occupy a specific spot in any collection. Rose gold signals formality on its own, and the Q1372510 puts a complication on top of it. The pointer at 10 o’clock sits at the top of its arc after a full wind and falls back across 40 hours, so the watch says it needs winding before it stops. The date is the second thing worth naming: a hand at 2 o’clock travels a short printed arc of numerals, which leaves the eggshell surface unbroken by a date window. A Master Ultra Thin super clone in rose gold carrying a power reserve, a radial date and small seconds covers more ground than the time-and-date references sharing the 39 mm case.

Eggshell on rose gold is the dressiest reading of the power reserve layout, and the two steel versions sit beside it in the full JLC Ultra Thin Master index. See the power reserve models in our JLC rankings for how the complication weighs against the moon phase and the calendar.

Specifications

• Model: JLC Master Ultra Thin Réserve de Marche
• Reference: Q1372510
• Case: rose gold
• Case size: 39 mm x 9.85 mm
• Dial: eggshell silvered, applied gold baton markers, AUTOMATIQUE signature
• Complications: power reserve indicator at 10, radial date at 2, small seconds at 6
• Movement: clone Cal. 938, automatic, 28,800 vph
• Power reserve: 40 hours (genuine Cal. 938: 43 hours)
• Water resistance: 50 m (same as genuine)
• Crystal: sapphire
• Strap: black alligator with pin buckle