Master Grand Tourbillon White Gold Aventurine

In Context

At 43 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 13.3 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 50 m covers rain and hand-washing comfortably; it is not a watch to swim in.

The movement winds itself from the motion of your wrist. Its 38-hour reserve wants wearing most days; leave it off and it stops. At 28,800 vph the seconds hand advances 8 times a second.

1663406 stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue dial with a white gold case. Beyond the time it carries a tourbillon.

The 978 is Jaeger-LeCoultre's automatic tourbillon, the movement of the Master Grand Tourbillon and the Rendez-Vous Tourbillon. It powers 17 watches in this library. It has 302 parts and 33 jewels at 7.1 mm high, beating at 28,800 vph with the tourbillon cage at 6 o'clock and a date on the Master version, and it is wound by a full rotor rather than by hand, which was unusual for a tourbillon when it appeared in the mid-2000s. The glossary defines the [tourbillon](/glossary/tourbillon). In the library it powers 9 [Rendez-Vous](/brands/jaeger-lecoultre/rendez-vous) Tourbillon references at 39 mm, in white and pink gold with diamonds, 7 [Master](/brands/jaeger-lecoultre/master) Grand Tourbillons at 43 mm and one [Master Grande Tradition](/brands/jaeger-lecoultre/master-grande-tradition). The [382](/calibers/jaeger-lecoultre-382) is the Duomètre's Sphérotourbillon on two axes, and the [177](/calibers/jaeger-lecoultre-177) the first Gyrotourbillon.

16 other watches in the library run the Jaeger-LeCoultre 978.

Jaeger-LeCoultre

Rendez-Vous Jewelery Tourbillon Pink Gold / MOP / Alligator

Q3412410 · 39 mm

Jaeger-LeCoultre

Rendez-Vous Jewellery Tourbillon Pink Gold / Serenity Blue

Q3412480 · 39 mm

Jaeger-LeCoultre

Master Grand Tourbillon Diamond Bracelet

1663314 · 43 mm

Jaeger-LeCoultre

Master Grande Tradition à Tourbillon 43 Pink Gold

1662510 · 43 mm