The exclusive calibre 5 movement powers this the first tag heuer formula 1 automatic timepiece naturally it features all the established tag heuer formula 1 features such as the case back with its classic checkered design the unidirectional turning bezel crowns the exclusive new case shape with its elegant sculpted horns and choice of black or white dials movement automatic power reserve 38 hourscase fine brushed polished steelcase diameter 41mmstrap black perforated rubber st