... this crosshair also from the "peripheral little second indication" at six o ' clock on watch dial.
in my feeling it is for a fast(er) (intuitive) decision what the hand/hands indicate.
Also we find it in more modern watches later, for example IWC Porsche Design.
This crosshair perhaps correspond with a inner orientation, that our brain is
aible to work with very fast.
regards
Stephan