Looking through the current model ranges from Tag Heuer (including the Carrera, Aquaracer, Formula 1, and Link), I see that all the automatic chronographs with 3 subdials have a 6-9-12 subdial configuration instead of 3-6-9. (One well-known automatic chronograph with a 3-6-9 configuration would be the Rolex Daytona.) Why is this so? When did this trend start? I'm asking because I've seen photos of vintage Carreras from the 1970s with a 3-6-9 layout. Is it a coincidence that the Calibre 1887 chronographs have this same configuration to match the Calibre 16 (Valjoux 7750, which from my limited understanding is always 6-9-12), or was it by design?