In a quiet room, it is audible when on the desk at about two feet away, and when I lift my arm near my head – striking my Rodin’s The Thinker pose – I can hear it tick-tocking at its frantic and impressive 36,000bph. Notably, the El Primero 400 is also as loud as it’s ever been, especially now, with the open dial, that allows sound to pass through the case with yet greater ease. The column wheel, horizontal clutch, automatic winding, and a beautiful movement and sub-dial layout make it a true classic.
It is, of course, a fully integrated chronograph caliber, composed of 278 parts, 31 jewels, and a balance wheel that beats at the much-loved 5Hz frequency, while power reserve runs over two full days at around 50 hours.
The movement inside remains the El Primero 400 Automatic, a classic iteration that falls very close to the original El Primero caliber – mind you, it is now behind a grey tinted crystal that makes it a bit more difficult to appreciate under some lighting conditions. Both the front and back feature sapphire crystal windows, with the front featuring dual-side AR-coating over its boxed and slightly domed crystal element. The Zenith Chronomaster El Primero Full Open 38.00 comes in a 38mm wide and 12.45mm thick case, sporting an ample 100m of water resistance and matched to an odd, 19mm wide strap.
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