SCHAFFHAUSEN
2000m
AUTOMATIC
AQUATIMER
A review by Damon, Marc & Kyle
~MOVEMENT~
DAMON:The movement is very robust and very accurate. My watch keeps time to less than a second or two a day. I don't know which parts IWC replaces with their own parts, but I trust IWC made the movement strong enough that it shouldn't fail me when I need it.
An IWC Caliber 37524 powers the Aquatimer. 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.For more information on Greg's views of this ETA/IWC movement, his wondeful article can be found here: IWC cal. 37524 in the Aquatimer and facts. - By Time Flies
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