Zenith Academy Open Repetition Minutes: World’s First Automatic Manufactured Chronograph with Minute Repeater

This Hyper Complication, a world record in the watchmaking industry is equipped with the new 4043 caliber, comprising a total of 461 components and 45 rubies. In order to combine these two complications, ZENITH has engineered and patented a system enabling the chiming mechanism to encircle the chronograph’s axes. For this reason the striking mechanism rack is made in one extremely complicated piece with teeth having concentric levers for the hours and minutes.

By activating the slide lever, it will chime : low for the hours, high for minutes, double tone for the quarter hour. A series of transparent openings in the dial reveal a fascinating ballet of hammers. And for those who wish to better see how the mechanism functions – rack triggering or the vibration of the cathedral tones – the Concept model is equipped with an entirely sapphire dial.

Made of solid gold, 45mm case, dial, applied indexes and hands, the Open Minute Repeater is for lovers of beautiful pieces and in particular for connoisseurs of Haute Horlogerie. Classical in rose gold with a hand guilloche silver dial or contemporary in the concept version in white gold with a transparent dial, these timepieces are available in numbered edition with a date stamp.

Hyper-Complication, with unique opening onto the Escapement & the Chiming mechanism
World’s first Automatic Manufactured Chronograph with Minute-repeater
Open El Primero 4043 Caliber: 461 Components, 45 jewels, 36’000 V/h
Available in Rose Gold & handmade guilloche dial & in White Gold with sapphire dial
Exclusive Millesime & Numbered Editions.

Technical details
Open El Primero 4043 Automatic
Calibre: 13 1/2“` (Diameter : 30.50 mm)
Height: 10.36 mm
Components : 461
Jewels: 45
Frequency: 36’000 V/h (5 Hz)
Power reserve: min. 50 hours
Finishing: 22-carat Gold oscillating weight with “Côte de Geneve” or “Grain d’Orge”guilloché pattern

Material: 18-carat White or Rose Gold
Diameter: 45 mm
Diameter opening: 35 mm
Crystal: Curved sapphire glass with antireflection treatment on both sides
Case-back: Transparent sapphire glass
Water-resistance: 30 meters

Handmade “Grain d’Orge” guilloché in 18-carat Gold or Sapphire transparent dial
Opening at 10 o’clock revealing heart of 4043 Caliber

Hours and minutes in the center
Small seconds hand at 9 o’clock
Minute Repeater
Chronograph: Central seconds hand;30-minute counter at 3 o’clock; 12-hour counter at 6 o’clock.

Handmade, Black Crocodile Leather strap lined with silky Alzavel calfskin
Buckle: 18-carat Gold triple folding buckle

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