IWC caliber 8531

Just sharing some pics I recently took..

IWC cal 8531
Feature: Hour, minute, second, date
Winding: Automatic with patented Pellaton winding system
Beat: 19,800 bph
Diameter: 29 mm
Height: 6.40 mm
Jewels: 21
Power Reserve: 42 hours
Balance Type: monometallic with variable inertia and fine adjustment
Balance Spring: Breguet