Rolex Movement Question

[Tools]

Originally Posted by 1000km

Sub seconds is actually far easier to make than centre-seconds from a watchmaking point of view. The sub seconds hand runs directly from the drive train rather than needing an additional gear, which is the case for centre seconds movements. The ancient ETA 6497 movement (which is derived from a Unitas pocket watch design) for example has sub seconds.

This is true..

Originally all seconds hands were at sub-6 since it can be direct geared there. It was an innovation to add extra gearing and the center-post to run sweep seconds.. Seems common now, but a hundred years ago was almost unheard of..