Grande Class Open
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Caliber
El Primero 4021H
Automatic chronograph movement
13``` caliber. Diameter 30 mm. Height : 7.75 mm. 248 components.
36'000 vibrations per hour
Power reserve over 50 hours
39 jewels
Measures short time intervals to a 10th of a second
Automatic winding in both directions
Central rotor on ball bearings
Heavy metal oscillating weight with "Côtes de Genève" or "Grain d'Orge" guilloche pattern, or 22-carat rose gold guilloché oscillating weight with "Grain d'Orge" pattern
Functions
Hours and minutes in the center
Small seconds-hand at 9 o'clock with a 3-branched hand
Power reserve indicator from hour axis
Central seconds-hand
30-minute counter at 3 o'clock
Case
18-carat rose gold or stainless steel case with satin-finish horns
18-carat rose gold or stainless steel ZENITH push buttons and crown
Grande Class Open: Diameter : 44 mm / Diameter opening : 36 mm
Class Open: Diameter : 40 mm / Diameter opening : 32.5 mm
Curved sapphire glass with anti-reflection treatment on both sides
Transparent sapphire case back
Water-resistance up to 50 meters
Dial
Open dial at 10 o'clock showing the heart of El Primero
Black or grey or silver with "Grain d'Orge" guilloché pattern or plain black, grey or silver dial
18-carat rose gold or rhodium hand-mounted applique arabic numerals
Hands
18-carat rose gold or rhodium faceted hands
18-carat rose gold power reserve hand, with black nickel coating on grey dials and rose gold versions
Strap
Black alligator leather strap, with tone-in-tone stitching, lined with silky Alzavel calfskin
Black rubber strap only available on versions with plain dials
Buckle
18-carat rose gold or stainless steel Class triple folded buckle stamped with the historical ZENITH star on the cap
Bracelet
Stainless steel bracelet with triple folding clasp, only available on steel versions with plain dials
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