[SDDS]

Originally Posted by Alcan

As Christopher said, the movement in your Daytona the Zenith El Primero caliber 400 (tweaked by Rolex and renamed 4030) with the seconds subdial at the 9:00 position. Newer versions with the in-house 4130 movement have the seconds sub-dial at the 6:00 position.

Also, the upper subdials on yours are exactly centered on the 3:00 - 9:00 equator, while 4130 models have the subdials moved above that point.

good point