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The Encyclopedia of Horology

Wristwatch · Triple calendar wristwatch with power reserve and moon phase

Jaeger-LeCoultre Master Calendar Ref. 147.8.41 S

Partially verified

This Jaeger-LeCoultre Master Calendar, reference 147.8.41 S, is a self-winding stainless steel wristwatch produced circa 2007. The watch features a complex complication suite including a triple date display, a 40-hour power-reserve indicator, and a moon phase display. Its three-body case is polished and constructed with concave lugs and an inclined bezel, measuring 40 mm in diameter and 13 mm in thickness. The satine silver dial displays applied steel dart indexes, luminous dots, and luminous steel alpha hands. The timepiece is signed on the dial, case, and movement.

Front view of the Jaeger-LeCoultre Master Calendar Ref. 147.8.41 S on a leather strap, showing the moon phase and calendar displays.
Front view of the Jaeger-LeCoultre Master Calendar Ref. 147.8.41 S on a leather strap, showing the moon phase and calendar displays. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Triple calendar wristwatch with power reserve and moon phase
Maker / attribution
Jaeger-LeCoultre
Reference
147.8.41 S
Catalogue / lot identifier
107
Source-reported date
circa 2007
Source-reported place
Switzerland
Source-reported serial
2491594

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Design

The timepiece is housed in a three-body stainless steel case featuring a polished finish. The design incorporates an inclined bezel and concave lugs, contributing to its profile. Access to the movement is provided via a transparent case back secured by four screws, while the case band includes correctors for setting the various calendar functions. The sapphire crystals are clear, allowing for unobstructed visibility of the internal components and dial.

The dial is finished with a satine silver surface, set with applied steel dart indexes and luminous dots. Time is indicated by luminous steel alpha hands. The dial layout includes a power-reserve sector at the 12 o'clock position, subsidiary seconds at 6 o'clock, and dedicated apertures for the display of days of the week, months, and moon phases. An outer Arabic numeral track tracks the date using a dedicated pointer.

Evidence for this section
  • “Three-body, polished, inclined bezel, concave lugs, transparent back with four screws, correctors on the band, sapphire crystals.”
  • “Satine silver with applied steel dart indexes and luminous dots, outer Arabic numerals for the date, 40 hour power-reserve sector at 12, subsidiary seconds dial, apertures for the days of the week, the months and the moon phases.”

Movement and Technical Specifications

The watch is powered by the Jaeger-LeCoultre caliber 924, a self-winding mechanical movement. The caliber is finished with rhodium plating and features fausses cotes decoration. Technically, it is constructed with 41 jewels, a straight-line lever escapement, and a monometallic balance equipped with a self-compensating flat balance spring.

The watch serves as a triple date complication, providing the user with calendar information alongside a moon phase and a power-reserve indicator.

Evidence for this section
  • “Cal. 924, rhodium-plated, fausses cotes decoration, 41 jewels, straight-line lever escapement, monometallic balance, self-compensating flat balance spring, shock absorber, hack mechanism.”
  • “Very fine, self-winding, water-resistant, stainless steel wristwatch”

Condition and Accompaniments

The case is graded as '3' (Good), and the dial is graded as '1-01' (As new). The hands are identified as original to the watch.

The sale includes several associated items, specifically the original manufacturer's box and documentation. Furthermore, the package is completed by a stainless steel Jaeger-LeCoultre double deployant clasp and two additional spare straps.

Evidence for this section
  • “Movement: 1* As new Overhaul recommended, at buyer's expense”
  • “Case: 3 Good”
  • “Dial: 1-01 As new”
  • “Accompanied by the original Jaeger- LeCoultre box, guarantee, instruction booklet and 2 spare straps.”

Open research questions

  • What is the specific maintenance history associated with the recommendation for an overhaul?
  • Were the two spare straps supplied by the manufacturer or added by a subsequent owner?

Source evidence

Recorded claims and source quotations for Jaeger-LeCoultre Master Calendar Ref. 147.8.41 S
FieldSource-reported valueSource quotation
Reference147.8.41 S“Ref. 147.8.41 S”
Serial Number2491594“case No. 2491594”
Movement Caliber924“Cal. 924”
Diameter40 mm“DIAM. 40 mm.”
Jewels41“41 jewels”
Production Datecirca 2007“Made circa 2007.”
Case ConstructionThree-body stainless steel“Three-body, polished, inclined bezel, concave lugs, transparent back with four screws”

Visible details

  • Satine silver dial with applied steel dart indexes
  • Power-reserve sector indicator at 12 o'clock
  • Transparent case back secured by four screws
  • Correctors for date adjustments located on the case band

Research qualifications

  • The movement is reported to require an overhaul at the buyer's expense
  • The precise current functional accuracy of the movement is not detailed beyond its 'as new' grading

Photograph identity and source facts were screened before import; rights clearance remains pending.

Terms in this record

Glossary explanations for terms named in this object’s record.