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 ...

Watchmaker Kari Voutilainen has restored ten of the most-awarded Observatory chronometer movements in history for a new Zenith limited edition. The project – instigated by auction house Phillips in ...

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 ...

Collaborations are all the rage in the luxury world, but some deserve more attention than others. The Zenith X Voutilainen X Phillips Niobium Cal 135-O is one of those exceptions. That’s because the ...