- Astronomical indications
Chronomaster El Primero Grande Date Full Open square
An impressive build plus a clear view of the legendary El Primero Chronograph movement, precise to 1/10th of a second: introducing the new Chronomaster, which also displays sun and moon phases. This heavenly ballet is materialised by two overlapping discs. The moon disc rotates once in 59 days while the day/night disc makes its rotation in 24 hours. The absence of a dial combined with the sapphire crystal case back leaves this robust chrono in steel open to admiration from all sides. A silver flange ringed with blue, a black and white minute track plus facetted luminescent markers and hands provide perfect legibility without obstructing the spectacle of the mechanics inside. When it comes to precision, Zenith has nothing to hide.