Greubel Forsey Tourbillon 24 Secondes
High confidenceThe rotation period is the specification and it is directly measurable with nothing but a second hand. Twenty-four seconds against a conventional sixty is a large and unmistakable difference, which makes this among the most straightforwardly verifiable claims in the high-horology part of the catalog. The 25-degree inclination and the 24-second period are not arbitrary: Greubel Forsey states them as the combination that tested best chronometrically, which is why they are quoted as exact figures rather than approximations and why an examiner can hold the watch to them.
Specifications
- Movement manufacturer
- Greubel Forsey
- Frequency
- 21,600 vph (3 Hz)
- Power reserve
- 90 hours
- Winding
- manual
- Complications
- Inclined tourbillon · Twenty-four-second rotation
Architecture
A manually wound caliber with a single tourbillon carriage inclined at twenty-five degrees and completing one revolution every twenty-four seconds rather than the conventional minute. Driven by three fast-rotating coaxial barrels. The cage comprises 86 components in low-density aerospace alloys and weighs 0.38g.
Authentication notes
- MovementProbable
Time it
One revolution every twenty-four seconds, on a visibly inclined axis. Timing the carriage requires no equipment and settles whether the mechanism is what it claims to be; combined with the visible inclination it constitutes a complete functional identification.
References using this caliber
Invention · Whole production
Provenance of this record
Sources & Evidence
Greubel Forsey — invention documentation and caliber specifications
Greubel Forsey SA
- Accessed
- 2026-08-19
Cited for
Last verified: Not yet reviewed