Port-Royal Open

Case material
Bracelet strap

CaliberEl Primero 4021 B
Automatic chronograph movement
13''' caliber. Diameter 30 mm. Height : 7.75 mm. 248 components
Rectangular auxiliary plate: Dimensions: 27.5 mm x 32 mm (Grande Port-Royal) 27.3 mm x 30 mm (Port-Royal)
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 “Damier” guilloché pattern
FunctionsHours, minutes in the center
Small seconds-hand at 9 o'clock with a 3-branched hand
Power reserve indicator from hour axis
Central second hand
30-minute counter at 3 o'clock
CaseStainless steel brushed case
Steel push-buttons and crown
Grande Port-Royal: Dimensions: 36 mm x 51 mm / Opening: 26.5 mm x 31 mm
Port-Royal: Dimensions: 34 mm x 48 mm / Opening: 25 mm x 29 mm
Transparent sapphire case back
Water-resistance up to 50m
DialSilver or Black guilloché dial
Transferred numerals, Applied indexes and ZENITH Star
HandsRhodium or Black nickel faceted hours and minutes hands
18-carat rose gold power-reserve faceted hand
StrapBlack alligator leather strap, hand-stitched tone-in-tone, lined with silky Alzavel calfskin
Black rubber strap
BuckleStainless steel brushed triple folding buckle stamped with the historical ZENITH star on the cap