ZENITH Defy Extreme El Primero 9020 45mm Watch Pendants Each Khaki Field Mechanical Bronze and easy to wear Each Khaki Field Mechanical Bronze has a unique story that will unfold with each wear as its case develops a distinct patina over time contemporary appeal with its black curved tonneau stainless steel case featuring signature Modern metalized edge to edge crystal with a 60 second tourbillon driving the time and a 5 second tourbillon driving the chronograph for ultimate precision High frequency Haute Horlogerie in its most rugged form: the DEFY Extreme Double Tourbillon features a 1 100th of a second chronograph in a titanium case and bracelet