I am a lefty for writing, right-handed for everything else. I remember in school it was much easier to write and check the time concurrently. Got to know precisely when the class is over to gtfo.
UPDATE
So I brought the watch in for service and "timing" whatever that means. I'm pretty sure the guy did nothing.
What I noticed was that when the watch is sitting on a table motionless, it keeps perfect time. When I wear it, then it begins to lose time. What a joke.
I could just hang it on the wall, it's big enough to be a clock.