Let's assume you have a small collection of four Pilot Watches.
How do you decide what to wear each day?
A Pilots Watch Mk XX is the easiest to wear every day.
But if you wear it for a week, everything apart from the Big Pilot will stop.
Are you okay for the other watches to stop for a few weeks?
You could wear each watch for two days in a round-robin, but then the watch might not match the activity of the day.
This definitely counts as a First World Problem, but I'd be interested in what others do :-)