IWC Portugieser Tourbillon Retrograde Chronograph

Blue dial
Blue alligator leather strap by Santoni Strap width 22.0 mm
Portugieser Tourbillon Retrograde Chronograph
The tourbillon is one of the most fascinating achievements in the art of watchmaking. The balance wheel is placed in a cage that constantly revolves around its own axis. This not only creates a visual spectacle on the dial, but the constant rotation also reduces the influence of gravity on the oscillating system and contributes to a more precise rate. The flying minute tourbillon of the Portugieser Tourbillon Retrograde Chronograph is positioned at 6 o’clock. Thanks to the integrated tourbillon stop, the movement can be brought to a complete stop by pulling out the crown and the time set with down-to-the-second accuracy. The pallet lever and the escape wheel have been treated with a special coating. This so-called Diamond Shell technology reduces friction and improves the flow of energy in the movement. The 12 o’clock position is reserved for the chronograph counter, where the stopped hours and minutes are displayed together. Finally, at 9 o’clock, there is the retrograde date display, whose hand jumps back to the initial position at the end of each month. All three complications are powered by the IWC-manufactured 89900 calibre. Oscillating at a frequency of 4 hertz, the chronograph movement features an automatic winding mechanism that builds up a power reserve of 68 hours. This Haute Horlogerie masterpiece is presented in an exquisite platinum case and with a blue dial. The watch is fitted with a blue alligator leather strap from Santoni.
Retrograde date display | IWC Schaffhausen
The retrograde date display shows the passing of the month with a date hand that moves in an arc from the 1st to the 31st of the month. After 31 days have passed, the spring is no longer under tension and allows the date hand to jump back to “one”. In months with fewer than 31 days or when the watch has not been used for a while, the date display can be advanced rapidly using the crown. This does not involve resetting the time.
Hacking tourbillon | IWC Schaffhausen
The hacking tourbillon makes it possible to stop the tourbillon at any time, with the balance and cage in any position. Until now, for IWC tourbillon watches, pulling out the crown would stop the hour and minute hands, but the gear train would continue to run. Now, the balance, and thus the entire gear train including all hands, is also stopped. When the crown is pulled out, the mechanism is stopped by two levers that grip the balance rim like a set of pliers.
Feather:
Rotor in 18-carat 5N gold
Sapphire glass, arched-edge, antireflective coating on both sides
Flyback function
Hour and minute counters combined in a totalizer at 12 o’clock
Chronograph function with hours, minutes and seconds
Hacking tourbillon mechanism
Flying minute tourbillon
Retrograde date display
Limited to 50 pieces
Case
Platinum Case
Diameter
43.5 mm
Height
15.9 mm
Back case
See-through sapphire glass back
Water resistance
3.0 bar
Movement:
Calibre
89900 Calibre
Movement type
Automatic winding, IWC-manufactured movement
Power Reserve Indicator
68 hours
Frequency
28’800 VPH (4 Hz)
Components
375
Jewels
42
Finishing
Cotes de Geneve