Nauticalia

On the outside it looks like a traditional mechanical alarm clock, but inside is a receiver for the time signal broadcast by the atomic clock at Anthorn. This means it's accurate to about one second in a million years, and it even changes to Summer/Winter time on the right day - the only reason you'll ever be late is if you somehow manage to ignore the very loud bell alarm!

Diameter 4.25", height 7", uses one C battery (see ref: 93196).