The Zenith Chronomaster El Primero Full Open is powered by an automatic movement contained within a 42mm stainless steel case. The openwork dial is protected by a sapphire crystal. Features include a date window at the six o’clock position and a chronograph function with silver, gray, and blue lined subdials. The black alligator leather strap is lined with protective rubber and features a deployant buckle. Water resistant to 100 meters.