Operating the signature feature of the Richard Mille RM 63-02 World Timer (richardmille.com) is a straightforward process. The rotating bezel on the $145,000 timepiece displays the names of major cities in each of the world’s 24 time zones. Once you turn the city corresponding to the local time zone to the 12 o’clock position, you can determine the time in any other zone by noting the appropriate city. While the operation is simple, the ball-bearing system that underlies the feature embodies the type of intric…