Jaeger-LeCoultre Master Control Calendar
Q4148420
2-year warranty, extendable to 8 years. Register here
*Currently out of stock
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The Jaeger-LeCoultre Master Control Calendar exemplifies timeless elegance and technical ingenuity. Crafted in stainless steel, this 40mm timepiece presents a balanced and sophisticated design, featuring a silver sunray-brushed dial with a clear layout. The day, date, and month are displayed prominently, complemented by a moon phase indicator within a semi-circular aperture. A standout feature of this model is the innovative "jumping date" mechanism, allowing the date hand to leap over the moon phase sub-dial, preserving an uninterrupted view. This detail highlights Jaeger-LeCoultre's commitment to both functionality and design precision. The watch is powered by the in-house calibre 866, a self-winding movement offering a power reserve of 70 hours. Visible through the sapphire caseback, the movement is adorned with fine finishing, such as Côtes de Genève and perlage, exemplifying the brand’s mastery in haute horology.
Full Specification
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Brand Jaeger-LeCoultreCollectionMaster ControlSeriesN/AModel NoQ4148420
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MovementFeatures Day-Date, Moon Phase, Small Seconds, MonthMovement AutomaticCalibre 866CaseCase Size 40 mmCase Thickness 10.95 mmCase Shape RoundCase Material SteelCase Back See-through Case BackLug Width 20 mmGlass Material Sapphire CrystalDialLuminosity On Hands, Hour MarkersDial Colour SilverHands DauphineIndexes DauphinesStrapStrap Material LeatherStrap Colour BrownInterchangeable Strap YesClasp Type Double Folding BuckleBuckle/Clasp Material SteelOtherGender MenWater Resistance (M) 50Warranty Period 2-year warranty, extendable to 8 years. Register hereCountry of Origin Switzerland
About the Jaeger-LeCoultre Master Control Collection
Introduced in 1992, the Jaeger-LeCoultre Master Control collection draws its name from the maison’s uncompromising "1000 Hours Control" certification, a rigorous series of tests that push each timepiece to the limits of precision, reliability, and durability. This meticulous approach ensures that every watch leaving the workshop meets the brand's highest standards of excellence. The collection has become a benchmark for mechanical ingenuity, showcasing Jaeger-LeCoultre’s ability to combine traditional craftsmanship with modern refinement.
Design And Features
True to its ethos, the Master Control collection is distinguished by its clean, minimalist design, favouring function over embellishment while maintaining an aura of quiet luxury. The round cases, often crafted in stainless steel or rose gold, exude timeless appeal with their slender profiles and polished surfaces. The dials, whether silvered or sunray-brushed, are meticulously laid out, featuring applied indices and dauphine hands that enhance legibility. Notable models, such as the Master Control Date, Master Control Chronograph, and Master Control Calendar, reflect Jaeger-LeCoultre’s ability to incorporate useful complications into sleek designs.
Iterations And Movements
Among the many outstanding models within the Master Control collection, the Master Control Geographic stands as a true horological gem. Combining elegance with practical sophistication, this timepiece features an innovative world time display. The second time zone can be adjusted with ease, while the city disc elegantly frames the dial, offering a harmonious balance between function and design. Another standout, the Master Control Chronograph Calendar, is a testament to the brand’s technical mastery, blending a chronograph complication with a triple calendar and moon phase, all within a streamlined case.
Powered by Jaeger-LeCoultre’s in-house automatic calibres like the 899 and 751, which are renowned for their technical innovation, boast impressive power reserves of up to 70 hours. Through sapphire crystal casebacks of some of the Master Control, wearers can admire the meticulous finishing and engineering that goes into each movement, including Geneva stripes and blued screws.

ABOUT THE MOVEMENT
The Jaeger-LeCoultre 866 calibre is a remarkable automatic movement, intricately composed of 344 individual components housed within a single barrel. This finely engineered mechanism is powered by 34 jewels and operates at a frequency of 28,800 vibrations per hour. With an impressive power reserve of 70 hours, the calibre achieves a strikingly slender profile of just 6.15mm. Its aesthetic appeal is enhanced by elegant Cote de Genève and perlage decorations, complemented by distinctive bluish screws. This calibre supports a range of functions, including hours, minutes, and small seconds, as well as day, month, and moon phase complications, making it an ideal and dependable partner for select Master Control watches.

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- Brand Jaeger-LeCoultre
- Reference 866
- Movement Automatic
- Display Analog
- Power Reserve approx. 70 hours
- Jewels 34
- Frequency 28800 bph
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