IWC Da Vinci SL Automatic

An IWC Caliber 37524 powers the Sl Automatic. It is based on the ETA 2892-A2, a rugged, ultra-thin movement found in many remarkable watches such as the Ulysse Nardin 1846 Marine Chronometer and the Omega Seamaster.

The ETA 2892-A2 has a diameter of 25.8mm; it is 3.6mm thick and has 21 jewels. It vibrates at a frequency of 28,800 bph (4 hertz) and has a power reserve of 42 hours. It has an Incabloc anti-shock system, a Navirox hairspring and a ball-bearing rotor that winds in both directions via a click wheel. The difference between the stock ETA and the IWC caliber are considerable.

Here is an excerpt from Time Flies article on the subject:

IWC uses a 2892 KIT -- not an assembled ebauche. They take this kit and replace parts or use parts of their own design to meet their own specifications for tolerance and strength. These include:

the gear train

wheels and levers

mainspring and barrel

a 21 K gold mass is added to the rotor for winding efficiency

all parts are finished and assembled by hand

Even though the movement is not visible from the outside, it is impeccably finished with gold plating, circular graining and Côtes de Genève engraving. It is also regulated in five positions to assure its incredible accuracy. Like many of the other wristwatches that use this ETA caliber, it has performed well within chronometer specifications.