Carrying the Reserve de Marche complication, this blue-dial JLC Master Ultra Thin replica channels the dressy-utilitarian balance that defines the Master Ultra Thin line. The blue sunburst dial pairs a power reserve indicator at 10 o’clock with a small seconds sub-dial at 6 o’clock, giving you both readouts without cluttering the face. Most Reserve de Marche references sit at 39mm in stainless steel, keeping the overall profile slim enough for a dress shirt cuff. A radial date at 2 o’clock rounds out the functional layout, pointing across an arc of numerals instead of sitting in a cut-out window.

Case & Movement Specs

• Case diameter: 39mm
• Case material: stainless steel
• Dial: blue sunburst with power reserve display
• Crystal: sapphire with anti-reflective coating
• Functions: hours, minutes, small seconds at 6 o’clock, radial date at 2 o’clock, power reserve indicator at 10 o’clock
• 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: leather with pin buckle

The power reserve gauge sits at 10 o’clock and reads along a sector scale, which is a hallmark of how Jaeger-LeCoultre integrates complications without sacrificing legibility. At full wind the indicator rests at the top of that scale and falls back over the following 40 hours; the genuine Cal. 938 runs 43 hours from the same full wind.

Caliber Breakdown

What separates the Reserve de Marche from a standard time-and-date watch is the mainspring tension readout routed to the dial. Inside this one is a clone of Cal. 938, automatic, beating at 28,800 vph, and its winding system feeds a barrel whose remaining energy is translated to that sector scale in real time. The genuine Cal. 938 fits 41 jewels into a movement 26 mm wide and 4.9 mm thick and holds 43 hours; the clone here holds 40. It is a complication that appeals to anyone who wants more information from their watch without stepping into chronograph or moon phase territory. For a broader look at this family, browse our Ultra Thin Master collection. If pure time-only appeals to you instead, the 1362511 39mm version strips the dial back to essentials while keeping the same slim case profile. Both share DNA, but the power reserve transforms the wearing experience by adding a layer of mechanical feedback.

How It Compares

Against standard Ultra Thin Master references, the Reserve de Marche trades a cleaner dial for genuine utility. You see the power state at a glance, something even many higher-priced competitors skip. The blue dial adds contrast that photographs well and shifts between deep navy and electric blue depending on lighting. This blue-dial Master Ultra Thin Reserve de Marche super clone puts wrist presence and practical complication into a single slim package.

The blue sunburst is one of the three Reserve de Marche dials in the range, and the silver and rose gold versions read that same arc differently. It is worth seeing where the Reserve de Marche lands in our JLC guide before choosing between a power reserve and a moon phase.

Specifications

• Model: Jaeger-LeCoultre Master Ultra Thin Reserve de Marche, blue dial
• Case: stainless steel
• Case size: 39 mm diameter, 9.85 mm thick
• Dial: blue sunburst
• Complications: power reserve indicator at 10 o’clock, radial date at 2 o’clock, small seconds at 6 o’clock
• 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 with anti-reflective coating
• Strap: leather with pin buckle