One-of-a-kind model developed by the Manufacture and the only prototype ever produced to develop and test the El Primero Stratos designed for Felix Baumgartner and which has become the first-ever supersonic watch.
In 1969, Zenith effectively launched the El Primero calibre by placing it on the landing gear of a Boeing 747 on the famous Paris-New York flight. Fully living up to the high expectations for this legendary movement, the watch was running as smoothly upon arrival as it had at the time of departure.
In 2012, it was from even higher, on the very edge of space, that Manufacture achieved a new historical feat as the creator of the very first watch to break the sound barrier (attaining a speed of Mach 1.25) in direct contact with the exterior. Resistant to sudden changes in pressure and temperature, as well as to extreme vibrations, this exceptional watch is a concentrated blend of the brand’s identity codes: the three colours of the iconic counters are all there; the mechanism beats at the high frequency of the El Primero movement, the world’s first automatic chronograph calibre; and the model also features the Flyback and Striking 10th (displaying tenths of a second via the sweep seconds-hand) functions
Case, Dial & Hands
Material: Stainless steel
Unidirectional rotating bezel with black ceramic disc
Diameter: 45.5 mm
Diameter opening: 35 mm
Thickness: 14.10 mm
Crystal: Box-shaped sapphire crystal with anti-reflective treatment
on both sides
Case-back: Solid case-back with Stratos mission logo
Water-resistance: 10 ATM
Dials: Silver-toned sunray with 3 coloured counters
Hour-markers: Rhodium with SuperLuminova SLN C1, faceted
Hands: Rhodium with SuperLuminova SLN C1, faceted
El Primero 4057B, automatic
Calibre: 13¼ ``` (Diameter: 30 mm)
Thickness: 6.60 mm
Frequency: 36,000 VpH – (5 Hz)
Power-reserve: min. 50 hours
Finishes: Oscillating weight with “Côtes de Genève” pattern.