Jaeger-LeCoultre caliber 174
The spherical 'Gyrotourbillon' is one of Jaeger-LeCoultre's emblematic complications. Featuring such, caliber 174 consists of 373 parts and has a power reserve of 50 hours.
Data on the tourbillon:
* Outer carriage: aluminium, 60 seconds for a complete rotation
* Inner carriage: titanium and aluminium, 18.75 seconds for a complete rotation
* Balance: inertia of 12.5 mg x cm2
* Balance frequency: 28,800 vibrations per hour