A large gold automatic fly-back chronograph wristwatch with date and registers, Zenith, 'El Primero ChronoMaster' 2001

18k, nickel lever movement, 31 jewels, mono-metallic balance, silvered dial with guilloché center, applied Arabic numerals, subsidiary dials for constant seconds, 30-minute and 12-hour registers, aperture for date between 4 and 5 o'clock, outer ring calibrated for tachometer, circular case with stepped bezel, sapphire crystal display back secured by 6 screws, case, dial and movement signed, with stainless steel and gilt deployant clasp.

Accompanied by a Zenith presentation case, certificate, chronometer rating certificate and user manual.