Some parts in a mechanical watch are so tiny and vulnerable that gravity disorients them, causing accuracy fluctuations depending on the position in which the watch is kept.
A tourbillon (pronounced "TOUR-bee-yon") defies gravity and provides greater precision in the timekeeping of a mechanical watch by protecting those parts.
This high complication remains one of the most difficult and complex movements to master.
Historically, tourbillons have commanded top prices and were out of reach of all but the extremely wealthy. Very few watch houses have the time and experience to produce tourbillon watches, driving up prices even higher.
Watch houses usually produce a few dozen pieces of tourbillon watches each year, as only the most skilled watchmakers are capable of making the handcrafted movement. Considered one of the most complex watch complications, tourbillons are prized for their engineering and design principles.
The higher price is attributable to the complexity of the tourbillon mechanism, which is created within extremely tight mechanical tolerances with specialized tooling. Crafting a tourbillon requires more parts and time than in other movements. Dedicated tools and machinery are required to manufacture a tourbillon as well as special lightweight and durable metals.

Movement Hand winding mechanical Tourbillon movement
Frequency 21600 vibrations/hour (3Hz)
Tolerance -10 / + 30 seconds per day
Power Reserve 42 hours
Jewels 21
Movement Dimensions Ø 30 mm, thickness 5.10 mm