Zenith Defy El Primero 21 (49.9000.9004/78.R582). El Primero 9004 automatic chronometer movement with 50 hours power reserve. New 1/100th of a second chronograph function. 2 escapements - 1 for watch (36,000 - 5Hz) & 1 for the chronograph (360,000 VpH - 50hz). Central chronograph hand. Hours and minutes ruthenium-plated hands coated with Superluminova, with index hour markers. Openworked dial with 2 different colours counter subdials. Fixed bezel set on a 44mm black ceramic case. Scratch resistant sapphire crystal on top and exhibition case-back. Water resistant to 100M. Black rubber strap with alligator leather coating and a titanium double folding deployment clasp with Black DLC coating.