The foundation of the timepiece is the caliber 135-O, which was Zenith’s most successful entry in the observatory competitions (the O specified that it was for the observatory competition, ...

Zenith’s historic Calibre 135-O chronometer movement got a new lease on life with last week’s unveiling of the Calibre 135 Observatoire Limited Edition, produced in collaboration with independent ...

Zenith claims this makes its Defy Lab the world's most accurate mechanical watch. Though portable mechanical clocks have been around since the early 16th century, it wasn't until 1675 that it was ...

The world of horology can be confusing at the best of times and downright exclusionary at the worst. Some of this is deliberate, of course, as brands want to convey a sense of mystery and exclu­sivity ...