World Time Digital released by Seiko in 1984.
The model number is A708-5000.
Just like an analog world clock, the names of cities around the world are lined up around it, but since this is a digital wristwatch that was made nearly 40 years ago, the city names listed give a sense of the times.
Therefore, I compared it with typical cities listed on the current world clock.

Currently, Seiko does not produce a digital world clock, so I compared it with CASIO's digital world clock "AE1200WHD-1A" (module 3299).
Casio's current model has an instruction manual PDF (Casio website) it can be downloaded from.

Since the city names of this model are written directly on the windshield, it is natural that there are fewer cities compared to the CASIO AE1200, which also has city names displayed digitally, but there are several points worth noting.
The year of release of this model (1984) compared to the present,

- Caracas (-4) in Venezuela was the richest city in South America until the early 1980s due to oil money, but it gradually declined due to the economic crisis and political instability in Venezuela, and is now one of the most insecure cities in South America.

・GMT (Greenwich Mean Time) has suddenly changed to UTC (Universal Time, Coordinated).
UTC is based on an atomic clock that uses cesium-133, and is the time adjusted by leap seconds to account for changes in the Earth's rotational speed, and is exactly the same as GMT in daily life.

・India's capital city, New Delhi (+5.5), has expanded during this period and has essentially become a single city, merging with Old Delhi, which was originally a separate city, so it is now commonly referred to simply as Delhi.

・Burma's "Rangoon (+6.5)" was renamed to "Yangon" in 1989.The city code "RGN" remains the same.
By the way, the name of the country itself was changed from Burma to Myanmar in 1989.

・China's "Beijing (+8)" was commonly called "Pekin" internationally in the 1980s, but its official English notation is "Beijing" and the city code is "BJS".

Functionally, the main function is the world time function, and there is no alarm function or stopwatch function.
I feel like it would be confusing to use the alarm function while also using the world time function.

In addition, the design is characterized by the windshield being curved glass.
Models that use curved glass often reduce visibility and are rarely used in digital watches, but this model incorporates curved glass without reducing visibility.
World clocks tend to look clunky because of the large amount of information on the dial, but this model uses curved glass to compensate for the large amount of information on the dial, and has an elegant design.