The name of the Da Vinci Tourbillon Rétrograde Chronograph alone reflects its unique status: on a single dial, it features a combination of a classic tourbillon, a chronograph and a retrograde date. IWC’s watchmakers have designed the new in-house 89900 calibre to make this distinctive constellation possible.
The most conspicuous feature of the 18-carat red gold Da Vinci Tourbillon Rétrograde Chronograph (Ref. IW393101) is the flying tourbillon. The tourbillon cage is bearing-mounted only at one end, on the underside, and is not connected to an upper bridge. The tourbillon also features a technically complex hacking function that guar- antees down-to-the-second accuracy when setting the watch. When the crown is pulled out, two levers grip the balance rim like a clamp and block the mechanism consist- ing of the balance, wheel train and hands. New geometry in the pallet and escape wheel combined with diamond shell technology ensures that the watch’s 68-hour power reserve when fully wound is maintained despite the add- itional complications.
Furthermore, the pallet and escape wheel are made of diamond-coated silicon, an extremely hard surface with good sliding properties that reduces fric- tion and thus resistance, which in turn benefits the power reserve. The chronograph function at “12 o’clock” allows stopped times of up to 11 hours and 59 minutes, which can be read off as easily as the time of day. The central seconds hand measures stopped times to an accuracy of one-quarter of a second.
The 18kt red gold case measures 44mm x 17mm. It has double AR-coated sapphire crystals and it is water resistant to 30 meters. Moveable horns.
The Swiss automatic IWC in-house caliber 89900 has 42 jewels, 28,800 vph and a power reserve of 68 hours. Retrograde date display Flying hacking minute tourbillon at “6 o’clock” Stopwatch function with hours, minutes and seconds Hour and minute counters combined in a totalizer at “12 o’clock” Flyback function Glucydur beryllium alloy balance with high-precision adjustment cam on balance arms 18kt red gold rotor.
It has a silver-plated dial. It has a retrograde date display, located on the left-hand side of the dial. The hand shows the date from the 1st to the 31st of the month as it moves across an arc and then, at the end of the scale, reverts to its starting point. 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 and conveniently using the crown.
It comes on a dark brown alligator leather strap by Santoni with an 18kt red gold folding clasp.
Contact me to get yours!