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Zenith - El Primero Stratos Flyback Rainbow

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Driven by the El Primero Calibre 405 B automatic movement built around a column wheel, the new Zenith El Primero Stratos Flyback Rainbow chronograph is made of black Alchron, a light and resistant titanium and aluminium alloy. 
It is equipped with a date display, a telemetry scale, and - as the name suggests - a flyback function, which enables the wearer to stop, start and restart the chronograph at a single press on the push-piece, compared with three presses required for a standard chronograph. The El Primero Stratos Flyback Rainbow  enables 1/10th second precision.

The 45.5 mm case  is topped by a rotating bezel bearing a scratch-resistant aluminium ring. 
A slightly domed anti-reflection sapphire crystal protects the dial side where the minutes counter at 3 o’clock appears in colours enabling night-time readings in infrared-lit cockpits, exactly like the first model developed in cooperation with a fighter pilot and presented in  1997. The hours are displayed at 6 o’clock while the small seconds at 9 o’clock. 

The white superluminova hour-markers create a contrast with the black of the dial and case, while the chronograph sweep seconds hand stands out in red. The inner bezel ring bearing a telemetry scale creates an overall depth effect. 
The transparent engraved sapphire case-back reveals the mechanism which beats at the frequency of 36,000 vibrations per hour and offers a power reserve of 50 hours.

A sporty rubber strap fitted with a black PVD-coated folding clasp completes the watch.
The El Primero Stratos Flyback Rainbow is a 250-piece limited edition exclusively available in Zenith Boutiques.

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