nlogax
路Watches have had sub-seconds since watches had seconds at all. Initially, sub-seconds movements were modified to add extra parts to make them sweep seconds. Eventually designs evolved to incorporate the sweep seconds in without having "add on" parts.
Here is an Omega movement with sub seconds - the original design:
To add sweep seconds, the center wheel is modified to have a through hole. Then a sweep seconds pinion is added that goes through the center wheel, a friction spring, and a bridge is added to hold it all in place. Then a driving wheel is pressed onto the extended 3rd wheel pivot to drive the seconds pinion, like this:
So no, sub-seconds is not considered a complication but sweep (central) seconds is.
Cheers, Al
I must admit I was being facetious, but thank you for the straight-man answer! That's really interesting 馃榿



