Boris
1009
That one is easy
My white 16570 does absolutely everything with me: work, workout, swim, travel, tennis, etc.
Played tennis twice with it this week, and will have another hit tomorrow as well.
Here it is, with a matching white / red vintage Kneissl racquet, circa 1987. Lots of fun playing with this, though obviously a very challenging frame given the 75cm2 head size.

I will also submit a picture of what is quickly becoming my daily office watch, for the times I do not want the take the Lange out. A beautifully understated watch you don't have to worry too much about. Here on a custom dark gold ostrich strap from Camille Fournet.