Jaeger-LeCoultre Master watches

Jaeger-LeCoultre Master is the family that runs from the Le Sentier manufacture's plain Master Control and Master Ultra Thin watches to its Master Grande Tradition tourbillons and minute repeaters. It starts with the Master Control, introduced in 1992 as the first Jaeger-LeCoultre collection to carry the brand's 1000 Hours Control certification, which tests the whole cased watch rather than the movement alone. That test gave the Master Control its name.

In 2020 Jaeger-LeCoultre relaunched the Master Control in a 40 mm case with a polished bezel and brushed case sides, sunray-brushed silvery-white dials, applied triangular indexes and dauphine hands. Four automatic models made up the relaunch: the Date with calibre 899 (40 x 8.78 mm), the Calendar with calibre 866 and the Geographic with calibre 939, each with 70 hours of power reserve, and the Chronograph Calendar with calibre 759 and 65 hours. The gold versions use Le Grand Rose, a gold alloy with palladium added. The earlier Master Control Date, such as the 1548420, is a 39 mm watch 8 mm thick, against 40 mm and 8.78 mm for the 2020 Date, 4018420.

The Master Ultra Thin line covers the moon-phase, perpetual-calendar, small-seconds, power-reserve and tourbillon models, from the 34 mm Moon to 41.5 mm. Its slimmest cases are the 38 mm Squelette at 3.6 mm, the 39 mm 1907 at 4.05 mm and the 40 mm pink gold Knife at 4.25 mm, limited to 100 pieces. The Memovox, an alarm watch Jaeger-LeCoultre first released in 1950, continues as the Master Memovox and Master Control Memovox.

Master Grande Tradition holds the high complications in pink gold, white gold and platinum: tourbillons, minute repeaters, perpetual calendars, Gyrotourbillons and the Grande Complication, whose flying tourbillon also shows sidereal time. Several are limited to runs of 18 to 200 pieces, and some carry enamel, aventurine or gem-set bezels. The platinum Master Gyrotourbillon 1 descends from the Gyrotourbillon I of 2004, the brand's first grande complication wristwatch, whose tourbillon turns in three dimensions.