Zenith presented the ChronoMaster at the Basel fair in 1994.

That was a good year for Zenith when during one and the same year they launched the 6 series (Elite movement), the calibre 420 hand wound El Primero (Zenith Prime) and the Zenith ChronoMaster (calibre 400 or 410)!

Here’s an excerpt from a 1994 yearbook of fine watches introducing the ChronoMaster:

A SHORT HISTORY AND OVERVIEW OF THE ZENITH CHRONOMASTER