This novelty timepiece, aptly named as Zenith Chronomaster El Primero “Full Open”, provides a breathtaking full view of the legendary El Primero self winding chronograph movement thanks to its entirely open – and open-worked – dial.
To ensure a better understanding of the fundamentals governing its flagship Chronomaster collection, Zenith offers its legendary El Primero chronograph in three different versions: with an entirely solid (closed) dial, a half-open (Open) dial, and now an entirely open (Full Open) dial.
This complete opening enables clients to grasp and visually appreciate the high frequency of the movement, the signature of the legendary El Primero integrated automatic column-wheel chronograph calibre with its 326 components (including 31 jewels), beating at the swift pace of 5 Hz (36,000 VpH) and thus capable of measuring and displaying the time with tenth-of-a-second precision. These attributes are inherited from its illustrious predecessor, the world’s most accurate series-produced chronograph developed by Zenith in 1969.
While the mechanism is now entirely revealed, there are nonetheless a few subtle nods to the historical version of the El Primero 1969: the date window of the 38mm version has been placed between 4 and 5 o’clock just like the original; and the famous blue colour is perfectly identical to the historical version. Combined with the two other colours, anthracite and rhodium, the three galvanic tones make a perfect match serving to magnify the movement.
The 30-minute counter at 3 o’clock, the 12-hour counter at 6 o’clock, and the small seconds counter at 9 o’clock that notably serves to verify the smooth operation of the movement. A silver-toned inner bezel ring, a black and white minute circle, together with facetted luminescent hands, combine to ensure optimal legibility, without obstructing the view of these captivating inner workings, while the elegant transfer centred inside the sapphire crystal provides the Zenith signature touch.
In terms of the case, the design also reflects the famous historical case of the 1969 El Primero Chronograph. Redesigned and modernised in 2010, this case has become a staple, revisited in every diameter and embodying the quintessence of Zenith’s creativity and timeless classicism. The case-back is of course open with a sapphire crystal revealing a resolutely modern architecture.
Available in two 38mm and 42mm diameters, in steel or a two-tone version with steel topped by an 18K pink gold bezel, and fitted with an alligator leather strap (black for the steel variation and brown for the two-tone steel and pink gold version) or a metal bracelet, this imposing, sturdy and sophisticated chronograph catches the gaze and plunges it into a cutting-edge mechanism by Zenith. Over 50-hour power reserve. Water-resistant to 100 metres.
Model: Zenith Chronomaster El Primero Full Open
51.2081.400/78.C810 (42mm, steel and 18K pink gold bezel)
03.2081.400/78.C813 (42mm, steel)
03.2081.400/78.M2040 (42mm, steel with metal bracelet)
51.2151.400/78.C810 (38mm, steel with 18K pink gold bezel)
03.2153.400/78.C813 (38mm, steel)
03.2153.400/78.M2150 (38mm, steel with metal bracelet)
El Primero 400, automatic
Automatic column-wheel El Primero chronograph with date
Calibre 13½“` (Diameter: 30mm)
Movement thickness: 6.6mm
Frequency: 36,000 VpH (5 Hz)
Power reserve: minimum 50 hours
Finishing: Oscillating weight adorned with “Côtes de Genève” motif
Central display of the hours and minutes
Small seconds at 9 o’clock
– central chronograph seconds hand
– 12-hour counter at 6 o’clock
– 30-minute counter at 3 o’clock
Date window at 6 o’clock (42 mm version) and between 4 and 5 o’clock (38 mm version)
Case and dial
Diameters: 42mm& 38mm
Crystal: Domed sapphire with anti-reflective treatment on both sides
Case-back: Transparent sapphire crystal
Material: Steel, and 18K pink gold for the bezel of the two-tone version
Water-resistance: 10 ATM, equivalent to 100 metres
Entirely open and skeleton-worked dial revealing the legendary movement
Hour-markers: Rhodium-plated or gold-plated, faceted and coated with Super-LumiNova® SLN C1
Hands: Rhodium-plated or gold-plated, faceted and coated with Super-LumiNova® SLN C1
Black or brown clean-cut alligator leather with rubber inner lining
Steel triple folding clasp