Defy Classic AIR El Primeor Fly-Back Limited Edition Ref.03.0531.4021 Zenith Box

• Self-winding mechanical movement Zenith El Primero 4021 caliber based on Zenith El Primero 400 with 39 jewels, 50 hours of power reserve and 36,000 vibrations/hour. Functions: Hours, minutes, small seconds and power reserve indicator. Chronograph with column wheel and Fly-back function.
• Steel case with a diameter of 46.5 mm. Black PVD bezel.
• Black dial with stylized airplane wings motif. Opening on the movement between 9 and 11 o'clock. Silvered 30-minute counter at 3 o'clock, power reserve indicator at 6 o'clock also on the wing of an airplane. Red hand in the center.
• Sapphire crystal
• Steel case back with screw closure and visible 4021FC movement.
• Original Zenith black rubber strap with original steel pin buckle.

Chronograph with Fly-Back function

The term Flyback was born in the 1930s in the aviation field, for pilots who had to stop a reading and start another immediately after to follow their flight plan. This function in fact allows you to switch from one chronograph reading to the next by pressing a single button.