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Jaeger-LeCoultre’s Master Control Calendar Q4148450 pairs a two-tone grey grained sector dial with the collection’s complete-calendar layout. Introduced on 25 September 2025, the 40 mm stainless-steel watch is limited to 500 pieces and uses the automatic Manufacture Calibre 866, with a 70-hour power reserve. Its most distinctive practical detail is the red-tipped date hand, which jumps clear of the moon-phase display between the 15th and 16th of each month.
What is new about the Q4148450?
The main change is the dial. Jaeger-LeCoultre divides its grey face into concentric zones—a lighter centre, grey hour ring, lighter minute chapter ring and darker outer date ring—and gives the surface a grained finish. The texture alters how the shades reflect and absorb light, adding contrast without departing from the restrained Master Control design.
The composition looks back to the sector-dial style of the mid-20th century. Applied triangular indexes, Arabic numerals at 12, 3 and 9, and faceted Dauphine hands keep the watch recognisably within the Master Control family. Jaeger-LeCoultre described the dial as a subtle homage to historic sector dials with a contemporary interpretation.
How does the calendar and moon phase work?
The watch displays hours, minutes and seconds alongside day, date, month and moon phase. Day and month appear in windows at the top of the dial. The moon phase sits inside the small-seconds sub-dial, while a red-tipped hand points to the date around the perimeter.
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#1 Best Overall
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Between the 15th and 16th of each month, the date hand makes a rapid 90-degree jump. That movement keeps it from crossing over the moon-phase display. This is a complete-calendar arrangement; the listed functions do not include a year indication.
Q4148450 specifications
| Specification | Jaeger-LeCoultre Master Control Calendar Q4148450 |
|---|---|
| Case | Stainless steel; 40 mm diameter; 10.95 mm thick |
| Water resistance | 5 bar |
| Movement | Manufacture Calibre 866, automatic winding; 6.15 mm thick |
| Movement details | 28,800 vibrations per hour (4 Hz); 344 components; 34 jewels |
| Power reserve | 70 hours |
| Functions | Hours, minutes, seconds, day, date, month and moon phase |
| Strap | Interchangeable black calfskin leather; 20 mm lug width |
| Edition | Limited to 500 pieces |
| Reference | Q4148450; internal reference JLQ4148450 |
Jaeger-LeCoultre’s official product details list the case and movement specifications, functions and strap details for Q4148450. The brand’s 25 September 2025 announcement also states a 70-hour power reserve.
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Price and availability
Jaeger-LeCoultre lists the Q4148450 as available in boutique rather than publishing a price on its product page. The brand’s collection page lists US$17,500 for the standard stainless-steel Master Control Calendar entry; that is collection price context, not a confirmed price for this limited edition. Check with a Jaeger-LeCoultre boutique for the current Q4148450 price and availability.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to consider before choosing it
The sector dial gives this version its character, while the calendar display adds more information than a time-only Master Control. When assessing it against other complete-calendar or sector-dial watches, useful points to compare are dial contrast and legibility, case dimensions, calendar layout, moon-phase visibility, power reserve, water resistance, strap, edition size and confirmed price.
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The official specifications establish the movement and functions, but do not provide independent accuracy testing or long-term wear results. Those aspects should not be inferred from the specification sheet alone.
Quick Recap
Best Value
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
