Surrounding all that is the world timer, with its recognizable city ring, which represents 24 cities from 24 different time zones, and the black/white 24-hour ring that indicates the correct time in each of the cities. It’s practical and easy to read, and because of the black-and-white 24-hour ring, you can also tell whether it’s day or night in the various cities. The city ring is static; however, the black/white ring is in constant motion and completes a full revolution in 24 hours. Everything can be easily set with the single crown at 3 o’clock. We reviewed the Traveller WW.TC for you last year and addressed everything you want to know about world timers.