El Primero 4021 SX

　　-Automatic Chronograph movement with harmonic plate 13``` caliber. Diameter 30 mm. Height : 7.75 mm. 248 components Balance, chronograph & pallet bridges in shock-absorbing Zenithium Z+

　　-Incabloc anti-shock device

　　-36000 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 carbon fiber inserts

　　-Hours and minutes in the center

　　-Small seconds-hand at 9 oclock with a 3-branched hand

　　-Power reserve indicator from hour axis

　　-Central seconds-hand

　　-30-minute counter at 3 oclock

　　-Titanium case. Diameter: 46.5 mm

　　-Titanium screw-in push-buttons with carbon fiber guilloch patterns

　　-Titanium screw-in crown with specific protecting device

　　-Graduated unidirectional rotating bezel & indexes in Titanium

　　-Helium valve at 10 oclock

　　-Titanium screw-in case back

　　-Water-resistance up to 1000 meters

　　-Multi-layered see-through structure composed of shock-resistant transparent Hesalite glass,

　　Black or grey carbon fiber layer and nitrocellulosed nickel-coated dial plate

　　-9-branched Open helical bridge in solid Gold

　　-Sapphire glass, 3.8 mm thick, with anti-reflective coating on both sides

　　-Rhodium-plated luminous hands with red Superluminova inserts

　　-Hour & minute skeleton rhodium hands

　　-High-temperature resistant bracelet in brushed white or black titanium

　　-Central links in composite materials, with carbon fiber for the black version.

　　-Lateral inserts in composite materials (white version) or Kevlar (black version)

　　-Brushed titanium triple folded c