Zenith Grande Concept Port-Royal Tourbillon Titanium PVD Semi-Skeleton 18k White Gold Dial 51x36mm 96.0550.4007/77.C55 Retail $150,00 LNIB 99% Excellent Condition 100% Authentic, Comes with presentation Box set, Manual, seen in photos Carbon Fiber Strap with Star signed Logo Deployment Buckle. Swiss made Star Zenith Grande Port-Royal Tourbillon 96.0550.4007/77.C550 Black PVD treatment Titanium Case 51x36mm Case diameter, Fixed bezel. Self Winding Automatic Chronometer - Chronograph Zenith Calibre 4007 Movement, Power Reserve 50/H. Display is Transparent Semi Skeleton metal guilloché, 18-carat white gold dial on a sapphire glass plate with grill - Window on Dial to View Balance Wheel. Silver - tone hands. Hours and minutes in the center Tourbillon: The carriage is positioned at 11 o’clock. The carriage makes 1 turn per minute Center seconds-hand 30-minute counter at 3 o’clock, 12-hour counter at 6 o’clock, Chronograph, sweeper at center. Minute divisions track at outer rim. Curved Sapphire glass with anti-reflection treatment on both sides Transparent sapphire case back. Screw down PVD Star logo crown, pushers. Carbon Fiber Strap with Star signed Logo Deployment Buckle. Scratch Resistant Sapphire Crystal. Water Resistant- 50 Meters / 165 Feet. Display signature, Caseback screw down Titanium, Movement signed..... Zenith Grande Port Royal Tourbillon - El Primero movement first idea was simple, but the technical specifications were not. It was to be the first automatic chronograph ever. Better still, the caliber was to be fully integrated and designed as an inseparable whole. There would be no additional module, but instead a construction built around a column wheel and a central rotor mounted on ball bearings. It would also need to beat at a high frequency in order to be the world’s most accurate chronograph. To complicate matters still further, the movement was to be miniaturized mechanism. enith..Sapphire exhibition caseback that reveals El Primero 4007 Automatic Chronometer - Chronograph movement with tourbillon 14’’’1/4 caliber. Diameter : 32 mm. Height : 7.55 mm. 298 components 36’000 vibrations per hour Power reserve over 50 hours 35 jewels. Heavy metal guilloché oscillating weight, decorated with “ZENITH Damier” pattern ....