Richard Attenborough wears an IWC Da Vinci Chronograph Moonphase

John Hammond, the billionaire who spared no expense building Jurassic Park, is played by Richard Attenborough in Spielberg's Jurassic Park (1993). On his wrist is a gold watch that watch-spotters read as an IWC Da Vinci Chronograph Moonphase, identified by the moonphase aperture at twelve and the Da Vinci's two-tier bezel case.

The Da Vinci, designed by Kurt Klaus, was IWC's perpetual-calendar chronograph, and a gold one fits a man whose defining trait is that he would not cut a corner. The identification is a visual inference rather than a documented placement, so it stays at that level.