978

About the Jaeger-LeCoultre 978

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.

In the library it powers 9 Rendez-Vous Tourbillon references at 39 mm, in white and pink gold with diamonds, 7 Master Grand Tourbillons at 43 mm and one Master Grande Tradition.

The 382 is the Duomètre's Sphérotourbillon on two axes, and the 177 the first Gyrotourbillon.