Master Control Calendar Steel | Ref. Q4148120 | 2031 Warranty Full Set

The Story

Introduced in 1992, the Jaeger-LeCoultre Master Control collection set a new benchmark for horological excellence by introducing the rigorous "1000 Hours Control" test—a brutal internal testing regime that evaluates the fully cased watch for precision, temperature resistance, and water-resistance far exceeding standard COSC testing. This contemporary 40mm Master Control Calendar (Ref. Q4148120) perfectly captures that relentless technical pursuit. It channels the golden era of mid-century triple calendar watches into a sleek modern aesthetic, serving as an incredibly sophisticated statement piece tailored for the collector who values under-the-radar mechanical pedigree over mainstream market hype.

The Craft: Triple Calendar Symmetry & Quick-Change Versatility

The 40mm stainless steel case balances classical elegance with modern wrist substance, sitting at a highly ergonomic thickness of just 10.95mm. The spectacular silver sunray-brushed dial is a masterclass in clean complication layout. The day and month are displayed through two crisp apertures beneath 12 o'clock, perfectly balanced at 6 o'clock by a recessed romantic moonphase complication that tracks the lunar cycle beneath an integrated small-seconds sub-dial. Rather than disrupting the dial symmetry with a standard window, a central pointer hand cleanly sweeps across the inner dial periphery to track the date.

Visible through the sapphire exhibition caseback is the magnificent In-house JLC Calibre 866. This next-generation automatic winding engine is meticulously decorated with traditional Côtes de Genève and hand-beveled edges, driven by a heavy openworked bi-directional rotor. Re-engineered for modern performance, it utilizes silicon components for the escapement to ensure total anti-magnetic stability and offers a robust 70-hour power reserve. Highlighting its immense daily versatility, the watch head incorporates a hidden quick-change bracelet system, allowing you to effortlessly swap between the rugged sport look of steel and formal leather without any tools.

Condition & Ultimate 2031 Extended Warranty Full Set

This exceptional Master Control Calendar is presented in Excellent overall condition, showing only the faintest, microscopic signs of careful occasional handling on its polished bezel and steel facets. The sapphire crystal is completely immaculate, and the stainless steel bracelet is tight with all factory links included. Maximizing the investment appeal of this package, the set includes a completely unworn original Jaeger-LeCoultre leather strap paired with its authentic unworn OEM JLC deployant folding clasp.

The timepiece arrives as a True Complete Full Set, complete with its original Jaeger-LeCoultre luxury presentation boxes, operating user manuals, setting tool, and the original international warranty card officially stamped in 2024. Following its official registration, the watch benefits from JLC’s premier factory protection with an active international warranty valid until May 22, 2031. Fully verified for amplitude stability and timing precision, this elite triple calendar grail is ready to anchor any world-class collection.