Over the past century, the Swiss watchmaker Zenith retained a very simple taste: simply being comfortable with the best. Now they’ve reached another step on the perpetual quest to attain perfect precision. The EL Primero combines a intricate tourbillon with a chronograph calibre featuring a built-in calendar and all that on a high frequency beat for the most precise chronometric performance yet. Thanks to the El Primero’s patented system, you’re able to watch the beauty of the tourbillon’s mechanism while always keeping an eye on the date that is placed right on top of the rotating cage. The case, in 18kt rose gold or in stainless steel, measures 44mm and encases a caliber 4035D, with 25 jewels, 36,000 vph and a power reserve of over 50 hours.