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The Benchmark for Accuracy - The First Automatic El Primero Integrated Chronograph with 1/10th of a Second Display The legendary El Primero movement developed by the Manufacture Zenith and first introduced on January 10, 1969 has proved a perpetual source of fascination. While all movement manufacturers were capable of producing automatic movements for classic watches, none had thus far ventured to develop such a system for a chronograph movement. It is historically acknowledged as the "first chronograph calibre with automatic winding by an oscillating weight pivoting on a centrally-placed ball bearing mechanism". Making an El Primero movement involves: a symbolic nine months of work during which 20 watchmakers play successive roles in developing and crafting this movement no less than 5,500 operations. 50 milling operations of various dimensions on the dial side. 77 other milling operations on the bridge side - 5 and 50 operations for each part - 18 different metals in its classic version. The heart of the El Primero beats at a rate of 36,000 vibrations per hour or in other words 864,000 a day, meaning 315,360,000 beats per year. One vibration corresponds to the position of the lever as it swings to and fro, making the alternating "tick" and "tock" sounds. As there are 3,600 seconds in an hour (60 seconds times 60 minutes), and since El Primero beats at a frequency of 36,000 vibrations per hour, the hands actually thus make 10 jumps per second, thereby marking off tenths of a second. Enhanced precision and readability through jumping seconds The Jumping Seconds chronograph is distinguished by a chronograph hand completing its rotation in just 10 seconds and thereby considerably improving the 1/10th of a second read-off. This significant new feature is backed by six-times larger divisions on the outer dial ring (10 seconds instead of 60) enabling totally accurate readings to within 1/10th of second. One particularly important feature of this model lies in the chronograph stop function. When it is stopped, the hand-locking system brings the hand to an extremely precise halt, since the brake-lever positions the hand between two of the 100 teeth on the chronograph wheel, thereby further enhancing the precision of the 1/10th of a second read-off. The original El Primero movement sweeps around the dial in 60 seconds in tiny 1/10th of a second jumps, meaning the chronograph hand performs 600 jumps a minute. The ultra-fast stopping and restarting of this large chronograph hand 10 times a second calls for a huge amount of energy. The watch functions had to be significantly improved and optimised to enable this energy-consuming acceleration. Seeking to reduce the energy required naturally entailed making the movement wheels as light as possible, which is why some of them are in silicon �C a material three and a half times lighter than its traditional counterparts. An attractive new face Driven by the El Primero 4052 B automatic calibre, the new El Primero Jumping Seconds chronograph comes in a choice of 18-carat rose gold or stainless steel for its 42mm case that is water-resistant to 100 meters and fitted with a transparent sapphire crystal on either side. The silver sunray-brushed dial features circular satin-brushed zones for the rose gold version. Both the stainless steel model and the gold model feature three counters. On the stainless steel version, these come in subtle shades of blue and grey. The faceted hands and hour-markers coated with Superluminova are rhodium-plated, or gold-plated on the rose gold models. The distinctive 1/10th of a second indication is clearly marked off by the dedicated chronograph hand. This elegantly sophisticated model is fitted with a choice of rubber-lined black or brown alligator leather strap, secured to the wrist by a pin buckle in stainless steel or 18kr rose gold, or by a stainless steel bracelet with triple folding clasp. Vividly embodying a revolutionary technical enhancement that is reflected in its stand-out design, the El Primero Jumping Seconds chronograph takes high-precision timing read-off to a whole new level.

Equipped with the latest innovations and superior technology, Zenith represents the finest form of Swiss wristwatches and suitable for the most fastidious clientele. The manufacture was founded in 1865 by a young watch expert, Georges Favre-Jacot, who has named the company after the star that designates the highest point in the universe. Zenith has grown considerably since then, earning global acclaim for its luxury watches and garnering many awards at international expositions. Today, the company creates wristwatches for both men and women. The watches are still manufactured according to the great watch*** tradition but with a more contemporary design and bolder approach as is the case of this new spectacular timekeeper signed Zenith, the El Primero Chronomaster Open Power Reserve. Merging all these aspects in a single watch, the brand is pleased to present us its new fashionable model that leaves no man indifferent.The emblematic feature of the new Chronomaster Open Power Reserve is the openings exposed by the dial that reveal the first automatic movement developed and manufactured exclusively in Zenith workshops – the highly popular El Primero movement. The magic of the mechanism lies in the number of beats – 36,000 alternations/hour, which means the movement makes 10 beats/second, a performance 25% higher than in other mechanisms available on the market. This supreme movement that animates the watch is composed of 248 parts, 39 jewels and stores energy for approximately 50 hours. Beside the aesthetic success of the 'uncovered heart', the new Zenith watch reflects the technical mastery of the brand's craftsmen: to make the heart of the El Primero movement visible, it has been placed to 10 o'clock, so the curious eyes can see into the perfectly synchronized vibrations. Furthermore, the Chronomaster Open Power Reserve employs a sophisticated dial which accommodates central hours and minutes and second chronograph counter with facetted, rhodium-plated hands, small seconds placed at 9 o'clock, a power-reserve indicator featuring a blue hand, a 30-minute indicator located at 3 o'clock also with blue hand, hand-set hour-markers and a tachymeter engraved on the flanges. A sapphire crystal coat anti-glare treated on both faces protects the case and the dial of the new model. The spectacular movement hidden inside is visible through the sapphire glass case-back. The timepiece features a 42mm case water-resistant to 100 meters and is mounted on a classy alligator leather strap available in brown or black, completing this piece of jewelry.Therefore, Zenith El Primero Chronomaster Open Power Reserve is a highly technical watch that displays a contemporary aesthetic design with highly finished features, suitable for the most demanding watch connoisseurs or for modern men who appreciate a high-quality accessory. The model is to be unveiled at BaselWorld 2011 and released in different variants: crafted in *** stainless steel case with either silver or black sun-burst dial, or with silver sun-burst dial in an 18K rose gold case or in a rose gold and stainless steel case.