HW80 Roller Retrograde Jumping Hours

HW80 Roller Retrograde Jumping Hours


- Hysek HW80 caliber
- Automatic, mechanical movement
- Roller retrograde jumping hours
- Sweeping minutes
- Perpetual Calendar with day, date, and month displayed on 4 rollers
- Leap year on a disc at 3 o’clock
- “Celestial sphere” Moon Phase display
- Hand-painted Moon and “celestial sphere”
- Second time band disc at 9 o’clock
- Power reserve indicator roller at 3 o’clock
-Seasonal Day-Night indicator roller at 9 o’clock
-Hand-painted numerals on rollers
- Rear-mounted flying tourbillon
- Platinum micro-rotor, offset and decorated by hot-wire cutting
- 2 barrels
- 1080 components
- 186 jewels
- 61 bridges
- 7 ceramic ball bearings
- Autonomy: 45 +/- 3 hours
- Hysek Titanium balance wheel
- Balance spring: PE4000 alloy
- Frequency: 28,800 vph
- Patent: CH00375/16

It takes 240 hours of work just to assemble the movement. In addition to the singular nature of its display and its perpetual calendar, it boasts three other complications: a second time band, a power reserve, and a seasonal day-night indicator.

The main difficulty with displaying hours and minutes has been that of transposing a flat display to the roller-based system that constitutes the guiding principle of the Colossal in both technical and aesthetic terms. One that barrier had been overcome, Hysek then set out to resolve one of the most insidious challenges with roller displays: the shift from 23.59 to 00.00. Logically speaking, the hour unit roller (the “3” in 23.59) should continue on its course to display a 4; but that would end up displaying the non-existent time of 24.00, inevitably followed by 25.00, and so on.

To prevent that, Hysek has developed an exclusive system – a world first: a few minutes before midnight, the roller discreetly moves backwards from a “3” to a “9” position, so that it can then jump, appropriately enough, to “0” – such that midnight is properly displayed. A patent has been filed for the reverse-and-forward roller system. It is based on an assembly comprising two main wheels that complete one revolution every 24 hours.

An exceptional timepiece deserves an exceptional escapement – and Hysek has been designing, developing, and assembling its own range of tourbillons for many years. A flying tourbillon has been selected for the Colossal, not least for its aesthetic qualities. Its cage is assembled on ceramic ball bearings.