Mechanical chronograph movement,IWC calibre 37524. Power reserve 42 hours. Sapphire glass secured against displacement by drop in air pressure. Waterproof to 200 m. Mod.3253.Stainless steel case and buffalo leather band.
Centre seconds with stop function.
Inner case made of antimagnetic soft iron. Sapphire glass secured against displacement by drop in air pressure. 3537.GST collection case in stainless steel. Mechanical automatic movement with alarm. Centre seconds with stop function.