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Zenith Grande Class Open Tourbillon El Primero

Posted by wristwatch on July 18, 2007

A star irradiates the dial, an unlikely divine intervention in a orderly world: an unusual design for an exceptional calibre with a tourbillon for the El Primero chronograph. A tourbillon ? One of the greatest watchmaking complications, posed in defiance of gravity enclosing the escapement in a gyroscopic cage. Attempting to associate it with the El Primero movement, the mythical chronograph beating at a rhythm of 36,000 vibrations per hour, seemed an impossible challenge. But the skilled watchmakers of ZENITH Manufacture succeeded and thus created the fastest Tourbillon in the world, the 4035 movement. The cage is surrounded by a rotating date disk and in the centre the ZENITH star rules supreme. In the modern version, the white gold case and motifs contrast with the smooth black of the dial. For the more traditional model, the rose gold case and the white guilloche dial blend perfectly.

* El Primero 4035
* Automatic chronograph movement with tourbillon
* 16 1/2“` caliber. Diameter : 37.5 mm. Height : 7.55 mm.
* 25 jewels. 325 components.
* 36’000 vibrations per hour
* Power reserve over 50 hours
* 35 jewels
* Measures short time intervals to a 10th of a second
* Automatic winding in both directions
* Central rotor on ball bearings
* 22-carat gold oscillating weight with “Grain d’Orge” or “Côtes de Genève”  guilloche pattern
* Hour and minutes in the center
* Tourbillon:
* • The carriage is positioned at 11 o’clock
* • The carriage makes 1 turn per minute
* Chronograph:
* • Center seconds-hand
* • 30-minute counter at 3 o’clock
* • 12-hour counter at 6 o’clock
* Date indication positioned around the carriage
* 18-carat rose or white gold case, push-buttons and crown
* Diameter : 45 mm
* Diameter opening : 36.5 mm
* Curved sapphire glass with anti-reflection treatment on both sides
* Transparent sapphire case back
* Water-resistance up to 50 meters
* Solid gold dial
* Deep black or silver with handmade “Grain d’orge” guilloché pattern
* All applied indexes and counters in solid gold
* 18-carat rose or white gold faceted hands
* Handmade black alligator leather strap lined with silky Alzavel calfskin
* 18-carat rose or white gold Grande Class triple folding buckle stamped with ZENITH star on the capSource

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