Due to relatives scattered around the world, I track the time in several time zones for the last 20 years or so.
Nothing comes close to the convenience of an Apple Watch.
First, you can add custom cities to your Apple Watch, so you can see the time in e.g. Dortmund (which has my relative) as opposed to Frankfurt (which is a big city that happens to define the time zone but has no relatives). With mechanical watches, you are limited to a selection of cities that might or might not be relevant to you.
Second, the DST renders any mechanical watch incorrect for at least half a year. One of my relatives is in Brazil, where they have DST in their summer (Dec-Feb), so mechanical watches are incorrect for almost a year (except for a couple of weeks around the DST shift). Again, Moscow has moved permanently to summer time. Apple Watch has all this covered.
Third, most GMT watches with 24-hour hand have a "night/day" bezel (black-grey aka "Batman", or blue-red aka "Pepsi"), but they all separate 24 hours into a 12-hour period of "day" (6am-6pm) and "night" (6pm-6am). Apple Watch shows the actual daylight and night time at any day of the week (so the "bezel" is split unevenly).
Mechanical watches are good at many things but being able to reliably track several DST-observing timezones is not one of them. In this, nothing even comes close to the convenience of an Apple Watch.
Nothing comes close to the convenience of an Apple Watch.
First, you can add custom cities to your Apple Watch, so you can see the time in e.g. Dortmund (which has my relative) as opposed to Frankfurt (which is a big city that happens to define the time zone but has no relatives). With mechanical watches, you are limited to a selection of cities that might or might not be relevant to you.
Second, the DST renders any mechanical watch incorrect for at least half a year. One of my relatives is in Brazil, where they have DST in their summer (Dec-Feb), so mechanical watches are incorrect for almost a year (except for a couple of weeks around the DST shift). Again, Moscow has moved permanently to summer time. Apple Watch has all this covered.
Third, most GMT watches with 24-hour hand have a "night/day" bezel (black-grey aka "Batman", or blue-red aka "Pepsi"), but they all separate 24 hours into a 12-hour period of "day" (6am-6pm) and "night" (6pm-6am). Apple Watch shows the actual daylight and night time at any day of the week (so the "bezel" is split unevenly).
Mechanical watches are good at many things but being able to reliably track several DST-observing timezones is not one of them. In this, nothing even comes close to the convenience of an Apple Watch.