Wake-Up Caller: Jaeger-LeCoultre’s Master Memovox

Jaeger-LeCoultre Master MemovoxThe Jaeger-LeCoultre Master Memovox was designed to keep time on the wrist and double as an alarm clock on the nightstand. In this test feature from our February 2010 issue, with original photos by Nik Schölzel, writer Alexander Krupp sees how the modern version of the watch performs at both tasks.

If you love elegant watches, you’re sure to be drawn to the outer appearance of Jaeger-LeCoultre’s Master Memovox, which debuted in January 2010. Its immaculately made, rose-gold case harmonizes with a silver-colored dial and a dark brown alligator-skin strap, which is secured to the wrist by a flat, double-folding clasp that accentuates the sleek classicism of the entire ensemble.

The dial’s outstanding craftsmanship is evident in its brushed surface, paper-thin printed lettering and faceted hour indices. The primary contributors to the case’s impressive appearance are a stepped bezel, which four screws hold in place from below, a perfectly polished middle piece with faceted lugs and an elaborately engraved back. We couldn’t help noticing that the engravings on the caseback, which surround the raised-relief logo, are positioned irregularly so that one-third of its periphery remains clean.

Jaeger-LeCoultre Master Memovox front

The watch uses a luminous arrowhead on a rotatable disk to indicate the alarm time.

But it’s really what’s inside the Master Memovox that makes it special. Under the massive caseback ticks one of the more than 1,000 mechanical calibers that Jaeger-LeCoultre has developed in the course of its 177-year history — and one of about 40 that are still in use. Automatic Caliber 956 was introduced two years ago to power the Memovox Polaris alarm wristwatch for divers.

Its ancestry can be traced to hand-wound Caliber 489, developed in 1949. This movement was used inside the first Memovox, which was presented at the Basel watch fair in 1951. That watch’s special feature was its alarm, which rang significantly louder when it was lying flat on a hard surface, such as the wooden top of a bedside table, than when it was on the wearer’s wrist. This meant the watch could be used as an effective substitute for a tabletop alarm clock. Jaeger-LeCoultre has refined this useful attribute, which many other wristwatch alarms lacked, over the years, and the watch has also evolved, with the present model being the most recent.

If the Master Memovox of 2010 is left lying flat against a hard surface in the evening, it will ring loudly enough the next morning to rouse even the deepest sleeper. The alarm tone is noticeably quieter if it rings when the watch is on the wrist. This means that if you want to use the watch in the office to remind you of an appointment, you needn’t worry that its chiming will bother your colleagues.

Also, you won’t have to listen to the metallic rasping and tinny grating characteristic of many alarm watches. The Master Memovox doesn’t make noise: it generates mellifluous sounds. Its tone is similar to the ringing of an old-fashioned telephone, but instead of sounding in intervals, it rings continuously for 18 seconds — about the same length of time as the alarms in other well-known alarm watches. The deviation between the actual alarm time and the set alarm time also remains within the standard limit of one to two minutes.

Some other alarm watches, including other models from Jaeger-LeCoultre, offer alarm mechanisms that can be set with greater accuracy. The alarms on many watches can be set in 12-minute, 10-minute, or even six- or five-minute increments, but the Master Memovox is calibrated only with quarter-hour indices. This means that the wearer has to be satisfied with setting the wake-up time to a tolerance of 7.5 minutes. This level of precision is high enough for a morning wake-up call, but if the wearer were using his watch to remind him of an appointment during the business day, he’d be advised to set the alarm to ring a few minutes early.

The alarm-time scale, which surrounds a rotatable disk in the center of the dial, does not intrude upon the dial’s harmonious appearance. On its periphery is a luminous arrowhead that can be positioned to point to the desired stroke along the alarm-time scale. The current time is always clearly discernible, and the date display, inside a window in the wreath of hour indices around the periphery of the dial, is also perfectly legible. However, to read the time in the dark, the wearer must hold the narrow strips of luminous material on the hands up to a light source shortly beforehand; otherwise the luminescence is limited to the additional index dots and the alarm-time arrow.

Jaeger-LeCoultre has offered a self-winding alarm movement since 1956. Designated as Caliber 815, it was equipped with a unidirectional, hammer-type winding mechanism. The modern version uses a bidirectional rotor, but, like its predecessor, it supplies energy only to the main movement. The separate barrel to power the alarm mechanism must be manually wound using an additional crown at the 2 o’clock position. After winding, the wearer can pull this crown out and then turn it in one direction to set the alarm time or in the other direction to set the date. To avoid confusion, the crown is marked with the letter “D” (for “date”) and an arrow to indicate the correct direction of rotation. This solution is simple and very helpful: after all, a little turn in the wrong direction could set the alarm time inadvertantly or, even worse, jumble the date display, which would have to be advanced through an entire cycle until it was again correct.


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