Well, ok, the watch isn't actually atomic, but it automatically synchronises with an atomic clock in Frankfurt every night. This means it should always be accurate to the second (since it will not deviate by as much as a second in 24 hours).

It picks up a long-wave radio signal anywhere within a 1500km range of Frankfurt, which basically means the whole of Europe, including the UK; Scandanavia and even parts of Russia.

It automatically adjusts to summer time, and changing time-zone is just a question of telling it how many hours ahead or behind CET it should be.

If out of range of the transmitter, it will run on its own internal quartz time, flagging up in the display the number of failed synchronisation attempts since the last successful synchronisation. The 0 in the right-hand column here shows that there have been no unsuccessful attempts, so we know that it synchronised correctly last night (the 29 in the left-hand column is simply the seconds display):

In the main photo at the top of the page, I have the display set instead to the date.

My previous watch was a Junghans Solar-Tec, in which the watch-face was a solar panel that powered the watch. Junghans does do a range which are atomic-synched and solar-powered, but these are €300 more than the battery-powered atomic-synched ones. Even I had to admit that paying an extra €300 to save the cost of a €5 battery every couple of years didn't represent spectacularly good value, even if it would have had ultimate geek value.

I know I'm an appallingly late adopter of atomic-clock-synched watches, but the early ones were too nerdy even for an uber-geek. This one can be taken out in public.