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.
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.
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.
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
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