London's Six Swiss Railway Clocks

Precisely 70 years ago, Swiss designer Hans Hilfiker designed the Swiss Railway Clock. Apart from its design, the clock has one other unique feature in how it works.
The second hand takes 58.5 seconds to rotate around by 59 seconds, then the second hand pauses. It waits until a nationwide pulse is sent to every Swiss railway clock that a minute has passed, then the clock jumps to the minute and carries on for another 58.5 seconds. It's part of that railway's famous accuracy and timekeeping.