Built for the elements. The DEFY Extreme is a new expression of superlative precision and ruggedness, being the toughest 1/100th of a second chronograph ever made. The DEFY Extreme is powered by the El Primero 21 calibre, an exceptionally precise and yet rugged 1/100th of a second automatic chronograph with two escapements, beating independently at 36’000 VpH for the timekeeping part and 360’000 VpH for the chronograph.