Nice flyback you got there. My only beef with the legendary elprimero is that when you pulled the crown for setting the time position the second hand still running. Other than that is indeed a legendary movement.
At first glance it's either the Lewis Hamilton or the Fernando Alonso Calibre S Aquaracer.... but maybe Big Adam sees something I don't?
Keep it as it is and you'll be fine. It doesn't bother me really coz most of the time as long as it keeps up and gives me accurate time plus the history of the watch Im happy.
Oh look it's a Grand Formula One Carrera with a.... well I don't actually know what that date wheel is supposed to be! Nice Heuer branding on the clasp as well...