Grande Class Tourbillon

Caliber El Primero 4035
Automatic chronograph movement with tourbillon
16 1/2``` caliber. Diameter : 37.5 mm. Height : 7.55 mm.
Lower cage bridge in shock-absorbing Zenithium +
25 jewels. 325 components.
36'000 vibrations per hour
Power reserve over 50 hours
35 jewels
Measures short time intervals to a 10th of a second
Automatic winding in both directions
Central rotor on ball bearings
22-carat gold oscillating weight with "Grain d'Orge" or "Côtes de Genève" guilloche pattern

Functions Hour and minutes in the center
Tourbillon:
· The carriage is positioned at 11 o'clock
· The carriage makes 1 turn per minute
Chronograph:
· Center seconds-hand
· 30-minute counter at 3 o'clock
· 12-hour counter at 6 o'clock
Date indication positioned around the carriage

Case 18-carat rose or white gold case, push-buttons and crown
Diameter : 45 mm
Diameter opening : 36.5 mm
Curved sapphire glass with anti-reflection treatment on both sides
Transparent sapphire case back
Water-resistance up to 50 meters

Dial Solid gold dial
Deep black or silver with handmade "Grain d'orge" guilloché pattern
All applied indexes and counters in solid gold

Hands 18-carat rose or white gold faceted hands

Strap Handmade black alligator leather strap lined with silky Alzavel calfskin

Buckle 18-carat rose or white gold Grande Class triple folding buckle stamped with ZENITH star on the cap