Momentum Sea Quartz 30 In 1980, Magnum P.I. hit the airwaves and for the first 3 seasons, Tom Selleck as Magnum wore a Chronosport Sea Quartz 30. Some fans will remember him wearing a Rolex Pepsi GMT, which is true as that is what he wore for 5 seasons and thus is much more memorable to fans of the show. But true fans remember the original and though Chronosport is no longer around, technically it...